74720138 has 4 divisors (see below), whose sum is σ = 112080210. Its totient is φ = 37360068.

The previous prime is 74720119. The next prime is 74720159. The reversal of 74720138 is 83102747.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 66863329 + 7856809 = 8177^2 + 2803^2 .

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 as a sum of consecutive naturals, namely, 18680033 + ... + 18680036.

Almost surely, 2^74720138 is an apocalyptic number.

74720138 is a deficient number, since it is larger than the sum of its proper divisors (37360072).

74720138 is a wasteful number, since it uses less digits than its factorization.

74720138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37360071.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 74720138 is about 8644.0810963341. The cubic root of 74720138 is about 421.1911349563.

The spelling of 74720138 in words is "seventy-four million, seven hundred twenty thousand, one hundred thirty-eight".