71872015 has 4 divisors (see below), whose sum is σ = 86246424. Its totient is φ = 57497608.

The previous prime is 71871991. The next prime is 71872069. The reversal of 71872015 is 51027817.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51027817 = 53 ⋅962789.

It is a cyclic number.

It is not a de Polignac number, because 71872015 - 2⁵ = 71871983 is a prime.

It is a super-3 number, since 3×71872015³ (a number of 25 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (31) 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 an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7187197 + ... + 7187206.

It is an arithmetic number, because the mean of its divisors is an integer number (21561606).

Almost surely, 2^71872015 is an apocalyptic number.

71872015 is a deficient number, since it is larger than the sum of its proper divisors (14374409).

71872015 is a wasteful number, since it uses less digits than its factorization.

71872015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14374408.

The product of its (nonzero) digits is 3920, while the sum is 31.

The square root of 71872015 is about 8477.7364313831. The cubic root of 71872015 is about 415.7701188462.

The spelling of 71872015 in words is "seventy-one million, eight hundred seventy-two thousand, fifteen".