74661720 has 64 divisors (see below), whose sum is σ = 255985920. Its totient is φ = 17065344.

The previous prime is 74661701. The next prime is 74661721. The reversal of 74661720 is 2716647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74661721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43602 + ... + 45281.

It is an arithmetic number, because the mean of its divisors is an integer number (3999780).

Almost surely, 2^74661720 is an apocalyptic number.

74661720 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

74661720 is an abundant number, since it is smaller than the sum of its proper divisors (181324200).

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

74661720 is a wasteful number, since it uses less digits than its factorization.

74661720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88904 (or 88900 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 33.

The square root of 74661720 is about 8640.7013604221. The cubic root of 74661720 is about 421.0813405534.

The spelling of 74661720 in words is "seventy-four million, six hundred sixty-one thousand, seven hundred twenty".