66770040 has 64 divisors (see below), whose sum is σ = 201801600. Its totient is φ = 17672832.

The previous prime is 66770023. The next prime is 66770057. The reversal of 66770040 is 4007766.

It is an interprime number because it is at equal distance from previous prime (66770023) and next prime (66770057).

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14679 + ... + 18681.

It is an arithmetic number, because the mean of its divisors is an integer number (3153150).

Almost surely, 2^66770040 is an apocalyptic number.

66770040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

66770040 is the 6672-nd pentagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66770040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100900800).

66770040 is an abundant number, since it is smaller than the sum of its proper divisors (135031560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66770040 is a wasteful number, since it uses less digits than its factorization.

66770040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4156 (or 4152 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 30.

The square root of 66770040 is about 8171.2936552299. The cubic root of 66770040 is about 405.6896039717.

It can be divided in two parts, 667 and 70040, that added together give a palindrome (70707).

The spelling of 66770040 in words is "sixty-six million, seven hundred seventy thousand, forty".