74978420 has 24 divisors (see below), whose sum is σ = 171769248. Its totient is φ = 27264800.

The previous prime is 74978419. The next prime is 74978441. The reversal of 74978420 is 2487947.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170186 + ... + 170625.

It is an arithmetic number, because the mean of its divisors is an integer number (7157052).

Almost surely, 2^74978420 is an apocalyptic number.

It is an amenable number.

74978420 is an abundant number, since it is smaller than the sum of its proper divisors (96790828).

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

74978420 is a wasteful number, since it uses less digits than its factorization.

74978420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340831 (or 340829 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 74978420 is about 8659.0080263273. The cubic root of 74978420 is about 421.6758814889.

The spelling of 74978420 in words is "seventy-four million, nine hundred seventy-eight thousand, four hundred twenty".