74730639 has 16 divisors (see below), whose sum is σ = 104077440. Its totient is φ = 47648160.

The previous prime is 74730613. The next prime is 74730671. The reversal of 74730639 is 93603747.

It is not a de Polignac number, because 74730639 - 2¹⁵ = 74697871 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 74730597 and 74730606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74730679) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 844 + ... + 12254.

It is an arithmetic number, because the mean of its divisors is an integer number (6504840).

Almost surely, 2^74730639 is an apocalyptic number.

74730639 is a deficient number, since it is larger than the sum of its proper divisors (29346801).

74730639 is a wasteful number, since it uses less digits than its factorization.

74730639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11510.

The product of its (nonzero) digits is 95256, while the sum is 39.

The square root of 74730639 is about 8644.6884848443. The cubic root of 74730639 is about 421.2108651167.

The spelling of 74730639 in words is "seventy-four million, seven hundred thirty thousand, six hundred thirty-nine".