72496781 has 16 divisors (see below), whose sum is σ = 87177600. Its totient is φ = 58970688.

The previous prime is 72496777. The next prime is 72496793. The reversal of 72496781 is 18769427.

It is not a de Polignac number, because 72496781 - 2² = 72496777 is a prime.

It is a super-2 number, since 2×72496781² = 10511566510723922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72496771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8951 + ... + 15003.

It is an arithmetic number, because the mean of its divisors is an integer number (5448600).

Almost surely, 2^72496781 is an apocalyptic number.

It is an amenable number.

72496781 is a deficient number, since it is larger than the sum of its proper divisors (14680819).

72496781 is a wasteful number, since it uses less digits than its factorization.

72496781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6148.

The product of its digits is 169344, while the sum is 44.

The square root of 72496781 is about 8514.5041546763. The cubic root of 72496781 is about 416.9713744111.

The spelling of 72496781 in words is "seventy-two million, four hundred ninety-six thousand, seven hundred eighty-one".