71497988 has 24 divisors (see below), whose sum is σ = 139456800. Its totient is φ = 31874688.

The previous prime is 71497981. The next prime is 71497999. The reversal of 71497988 is 88979417.

It is a super-2 number, since 2×71497988² = 10223924576096288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (71497981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26378 + ... + 28961.

It is an arithmetic number, because the mean of its divisors is an integer number (5810700).

Almost surely, 2^71497988 is an apocalyptic number.

It is an amenable number.

71497988 is a deficient number, since it is larger than the sum of its proper divisors (67958812).

71497988 is a wasteful number, since it uses less digits than its factorization.

71497988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55379 (or 55377 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 53.

The square root of 71497988 is about 8455.6482897528. The cubic root of 71497988 is about 415.0476318290.

The spelling of 71497988 in words is "seventy-one million, four hundred ninety-seven thousand, nine hundred eighty-eight".