71409988 has 36 divisors (see below), whose sum is σ = 139159020. Its totient is φ = 31872960.

The previous prime is 71409973. The next prime is 71409991. The reversal of 71409988 is 88990417.

It is a happy number.

71409988 is nontrivially palindromic in base 16.

It can be written as a sum of positive squares in 2 ways, for example, as 7441984 + 63968004 = 2728^2 + 7998^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49258 + ... + 50686.

Almost surely, 2^71409988 is an apocalyptic number.

It is an amenable number.

71409988 is a deficient number, since it is larger than the sum of its proper divisors (67749032).

71409988 is a wasteful number, since it uses less digits than its factorization.

71409988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1508 (or 1475 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 71409988 is about 8450.4430653073. The cubic root of 71409988 is about 414.8772811773.

The spelling of 71409988 in words is "seventy-one million, four hundred nine thousand, nine hundred eighty-eight".