74879640 has 240 divisors, whose sum is σ = 278087040. Its totient is φ = 18057600.

The previous prime is 74879639. The next prime is 74879657. The reversal of 74879640 is 4697847.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 391945 + ... + 392135.

It is an arithmetic number, because the mean of its divisors is an integer number (1158696).

Almost surely, 2^74879640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 74879640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (139043520).

74879640 is an abundant number, since it is smaller than the sum of its proper divisors (203207400).

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

74879640 is a wasteful number, since it uses less digits than its factorization.

74879640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236 (or 212 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The square root of 74879640 is about 8653.3022598312. The cubic root of 74879640 is about 421.4906217439.

The spelling of 74879640 in words is "seventy-four million, eight hundred seventy-nine thousand, six hundred forty".