71872057 has 4 divisors (see below), whose sum is σ = 73625076. Its totient is φ = 70119040.

The previous prime is 71871991. The next prime is 71872069. The reversal of 71872057 is 75027817.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 43771456 + 28100601 = 6616^2 + 5301^2 .

It is a cyclic number.

It is not a de Polignac number, because 71872057 - 2⁷ = 71871929 is a prime.

It is a super-2 number, since 2×71872057² = 10331185154822498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71872357) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 876448 + ... + 876529.

It is an arithmetic number, because the mean of its divisors is an integer number (18406269).

Almost surely, 2^71872057 is an apocalyptic number.

It is an amenable number.

71872057 is a deficient number, since it is larger than the sum of its proper divisors (1753019).

71872057 is a wasteful number, since it uses less digits than its factorization.

71872057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1753018.

The product of its (nonzero) digits is 27440, while the sum is 37.

The square root of 71872057 is about 8477.7389084590. The cubic root of 71872057 is about 415.7701998344.

The spelling of 71872057 in words is "seventy-one million, eight hundred seventy-two thousand, fifty-seven".