66701040 has 80 divisors (see below), whose sum is σ = 236318208. Its totient is φ = 15245568.

The previous prime is 66701027. The next prime is 66701051. The reversal of 66701040 is 4010766.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 66701040.

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, 18172 + ... + 21531.

Almost surely, 2^66701040 is an apocalyptic number.

66701040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66701040 is an abundant number, since it is smaller than the sum of its proper divisors (169617168).

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

66701040 is a wasteful number, since it uses less digits than its factorization.

66701040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39726 (or 39720 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 66701040 is about 8167.0704662076. The cubic root of 66701040 is about 405.5498095834.

The spelling of 66701040 in words is "sixty-six million, seven hundred one thousand, forty".