72709558 has 4 divisors (see below), whose sum is σ = 109064340. Its totient is φ = 36354778.

The previous prime is 72709547. The next prime is 72709579. The reversal of 72709558 is 85590727.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 85590727 = 2161 ⋅39607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18177388 + ... + 18177391.

It is an arithmetic number, because the mean of its divisors is an integer number (27266085).

Almost surely, 2^72709558 is an apocalyptic number.

72709558 is a deficient number, since it is larger than the sum of its proper divisors (36354782).

72709558 is a wasteful number, since it uses less digits than its factorization.

72709558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36354781.

The product of its (nonzero) digits is 176400, while the sum is 43.

The square root of 72709558 is about 8526.9899730210. The cubic root of 72709558 is about 417.3789109435.

The spelling of 72709558 in words is "seventy-two million, seven hundred nine thousand, five hundred fifty-eight".