74856639 has 16 divisors (see below), whose sum is σ = 117258624. Its totient is φ = 41877600.

The previous prime is 74856629. The next prime is 74856641. The reversal of 74856639 is 93665847.

It is not a de Polignac number, because 74856639 - 2⁹ = 74856127 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74856629) 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, 86817 + ... + 87674.

It is an arithmetic number, because the mean of its divisors is an integer number (7328664).

Almost surely, 2^74856639 is an apocalyptic number.

74856639 is a deficient number, since it is larger than the sum of its proper divisors (42401985).

74856639 is a wasteful number, since it uses less digits than its factorization.

74856639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174518.

The product of its digits is 1088640, while the sum is 48.

The square root of 74856639 is about 8651.9731275588. The cubic root of 74856639 is about 421.4474604849.

The spelling of 74856639 in words is "seventy-four million, eight hundred fifty-six thousand, six hundred thirty-nine".