71642879 has 32 divisors (see below), whose sum is σ = 95385600. Its totient is φ = 52093440.

The previous prime is 71642843. The next prime is 71642887. The reversal of 71642879 is 97824617.

It is not a de Polignac number, because 71642879 - 2¹⁶ = 71577343 is a prime.

It is a super-2 number, since 2×71642879² = 10265404222817282, which contains 22 as substring.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71642819) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 299642 + ... + 299880.

It is an arithmetic number, because the mean of its divisors is an integer number (2980800).

Almost surely, 2^71642879 is an apocalyptic number.

71642879 is a deficient number, since it is larger than the sum of its proper divisors (23742721).

71642879 is a wasteful number, since it uses less digits than its factorization.

71642879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503.

The product of its digits is 169344, while the sum is 44.

The square root of 71642879 is about 8464.2116585067. The cubic root of 71642879 is about 415.3278079634.

The spelling of 71642879 in words is "seventy-one million, six hundred forty-two thousand, eight hundred seventy-nine".