75521138 has 32 divisors (see below), whose sum is σ = 143244288. Its totient is φ = 29005200.

The previous prime is 75521099. The next prime is 75521141. The reversal of 75521138 is 83112557.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7481 + ... + 14387.

It is an arithmetic number, because the mean of its divisors is an integer number (4476384).

Almost surely, 2^75521138 is an apocalyptic number.

75521138 is a deficient number, since it is larger than the sum of its proper divisors (67723150).

75521138 is a wasteful number, since it uses less digits than its factorization.

75521138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6998.

The product of its digits is 8400, while the sum is 32.

The square root of 75521138 is about 8690.2898685832. The cubic root of 75521138 is about 422.6908452380.

The spelling of 75521138 in words is "seventy-five million, five hundred twenty-one thousand, one hundred thirty-eight".