74021978 has 32 divisors (see below), whose sum is σ = 124966800. Its totient is φ = 32707584.

The previous prime is 74021977. The next prime is 74021999. The reversal of 74021978 is 87912047.

It can be written as a sum of positive squares in 8 ways, for example, as 73839649 + 182329 = 8593^2 + 427^2 .

74021978 is a modest number, since divided by 21978 gives 74 as remainder.

It is not an unprimeable number, because it can be changed into a prime (74021971) 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, 35468 + ... + 37496.

Almost surely, 2^74021978 is an apocalyptic number.

74021978 is a deficient number, since it is larger than the sum of its proper divisors (50944822).

74021978 is a wasteful number, since it uses less digits than its factorization.

74021978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2114.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 74021978 is about 8603.6026175086. The cubic root of 74021978 is about 419.8752047976.

The spelling of 74021978 in words is "seventy-four million, twenty-one thousand, nine hundred seventy-eight".