72991726 has 32 divisors (see below), whose sum is σ = 116379648. Its totient is φ = 34292160.

The previous prime is 72991703. The next prime is 72991733. The reversal of 72991726 is 62719927.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 447721 + ... + 447883.

It is an arithmetic number, because the mean of its divisors is an integer number (3636864).

Almost surely, 2^72991726 is an apocalyptic number.

72991726 is a deficient number, since it is larger than the sum of its proper divisors (43387922).

72991726 is a wasteful number, since it uses less digits than its factorization.

72991726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376.

The product of its digits is 95256, while the sum is 43.

The square root of 72991726 is about 8543.5195323707. The cubic root of 72991726 is about 417.9181291545.

It can be divided in two parts, 7299 and 1726, that added together give a square (9025 = 95²).

The spelling of 72991726 in words is "seventy-two million, nine hundred ninety-one thousand, seven hundred twenty-six".