71297928 has 64 divisors (see below), whose sum is σ = 213292800. Its totient is φ = 21936960.

The previous prime is 71297917. The next prime is 71297969. The reversal of 71297928 is 82979217.

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, 9888 + ... + 15503.

It is an arithmetic number, because the mean of its divisors is an integer number (3332700).

Almost surely, 2^71297928 is an apocalyptic number.

71297928 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is an amenable number.

71297928 is an abundant number, since it is smaller than the sum of its proper divisors (141994872).

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

71297928 is a wasteful number, since it uses less digits than its factorization.

71297928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25419 (or 25409 counting only the distinct ones).

The product of its digits is 127008, while the sum is 45.

The square root of 71297928 is about 8443.8100404971. The cubic root of 71297928 is about 414.6601524096.

The spelling of 71297928 in words is "seventy-one million, two hundred ninety-seven thousand, nine hundred twenty-eight".