66701880 has 320 divisors, whose sum is σ = 272859840. Its totient is φ = 14266368.

The previous prime is 66701879. The next prime is 66701881. The reversal of 66701880 is 8810766.

It is an interprime number because it is at equal distance from previous prime (66701879) and next prime (66701881).

It is a hoax number, since the sum of its digits (36) 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 (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66701881) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 385474 + ... + 385646.

It is an arithmetic number, because the mean of its divisors is an integer number (852687).

Almost surely, 2^66701880 is an apocalyptic number.

66701880 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66701880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136429920).

66701880 is an abundant number, since it is smaller than the sum of its proper divisors (206157960).

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

66701880 is a wasteful number, since it uses less digits than its factorization.

66701880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220 (or 207 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 66701880 is about 8167.1218920743. The cubic root of 66701880 is about 405.5515120077.

The spelling of 66701880 in words is "sixty-six million, seven hundred one thousand, eight hundred eighty".