71928831 has 8 divisors (see below), whose sum is σ = 103282480. Its totient is φ = 44263872.

The previous prime is 71928827. The next prime is 71928839. The reversal of 71928831 is 13882917.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 71928831 - 2² = 71928827 is a prime.

It is a super-2 number, since 2×71928831² = 10347513458053122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 1844329 = 71928831 / (7 + 1 + 9 + 2 + 8 + 8 + 3 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71928831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71928839) 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, 922126 + ... + 922203.

It is an arithmetic number, because the mean of its divisors is an integer number (12910310).

Almost surely, 2^71928831 is an apocalyptic number.

71928831 is a deficient number, since it is larger than the sum of its proper divisors (31353649).

71928831 is a wasteful number, since it uses less digits than its factorization.

71928831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1844345.

The product of its digits is 24192, while the sum is 39.

The square root of 71928831 is about 8481.0866638657. The cubic root of 71928831 is about 415.8796476764.

The spelling of 71928831 in words is "seventy-one million, nine hundred twenty-eight thousand, eight hundred thirty-one".