74639420 has 24 divisors (see below), whose sum is σ = 157626000. Its totient is φ = 29687552.

The previous prime is 74639419. The next prime is 74639447. The reversal of 74639420 is 2493647.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6845 + ... + 14004.

It is an arithmetic number, because the mean of its divisors is an integer number (6567750).

Almost surely, 2^74639420 is an apocalyptic number.

It is an amenable number.

74639420 is an abundant number, since it is smaller than the sum of its proper divisors (82986580).

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

74639420 is a wasteful number, since it uses less digits than its factorization.

74639420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21037 (or 21035 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 74639420 is about 8639.4108595436. The cubic root of 74639420 is about 421.0394134502.

The spelling of 74639420 in words is "seventy-four million, six hundred thirty-nine thousand, four hundred twenty".