74979720 has 48 divisors (see below), whose sum is σ = 243685260. Its totient is φ = 19994496.

The previous prime is 74979713. The next prime is 74979727. The reversal of 74979720 is 2797947.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (74979713) and next prime (74979727).

It can be written as a sum of positive squares in 2 ways, for example, as 62062884 + 12916836 = 7878^2 + 3594^2 .

It is a super-2 number, since 2×74979720² = 11243916822556800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (74979727) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 103779 + ... + 104498.

Almost surely, 2^74979720 is an apocalyptic number.

It is an amenable number.

74979720 is an abundant number, since it is smaller than the sum of its proper divisors (168705540).

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

74979720 is a wasteful number, since it uses less digits than its factorization.

74979720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208294 (or 208287 counting only the distinct ones).

The product of its (nonzero) digits is 222264, while the sum is 45.

The square root of 74979720 is about 8659.0830923372. The cubic root of 74979720 is about 421.6783185255.

The spelling of 74979720 in words is "seventy-four million, nine hundred seventy-nine thousand, seven hundred twenty".