72708861 has 4 divisors (see below), whose sum is σ = 96945152. Its totient is φ = 48472572.

The previous prime is 72708841. The next prime is 72708863. The reversal of 72708861 is 16880727.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16880727 = 3 ⋅5626909.

It is not a de Polignac number, because 72708861 - 2¹⁰ = 72707837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72708863) 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, 12118141 + ... + 12118146.

It is an arithmetic number, because the mean of its divisors is an integer number (24236288).

Almost surely, 2^72708861 is an apocalyptic number.

It is an amenable number.

72708861 is a deficient number, since it is larger than the sum of its proper divisors (24236291).

72708861 is a wasteful number, since it uses less digits than its factorization.

72708861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24236290.

The product of its (nonzero) digits is 37632, while the sum is 39.

The square root of 72708861 is about 8526.9491026979. The cubic root of 72708861 is about 417.3775772626.

The spelling of 72708861 in words is "seventy-two million, seven hundred eight thousand, eight hundred sixty-one".