71520990 has 16 divisors (see below), whose sum is σ = 171650448. Its totient is φ = 19072256.

The previous prime is 71520973. The next prime is 71521001. The reversal of 71520990 is 9902517.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1191987 + ... + 1192046.

It is an arithmetic number, because the mean of its divisors is an integer number (10728153).

Almost surely, 2^71520990 is an apocalyptic number.

71520990 is an abundant number, since it is smaller than the sum of its proper divisors (100129458).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71520990 is a wasteful number, since it uses less digits than its factorization.

71520990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2384043.

The product of its (nonzero) digits is 5670, while the sum is 33.

The square root of 71520990 is about 8457.0083362854. The cubic root of 71520990 is about 415.0921361210.

The spelling of 71520990 in words is "seventy-one million, five hundred twenty thousand, nine hundred ninety".