72781036 has 24 divisors (see below), whose sum is σ = 129313184. Its totient is φ = 35838720.

The previous prime is 72781021. The next prime is 72781057. The reversal of 72781036 is 63018727.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 72780992 and 72781010.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98926 + ... + 99658.

Almost surely, 2^72781036 is an apocalyptic number.

It is an amenable number.

72781036 is a deficient number, since it is larger than the sum of its proper divisors (56532148).

72781036 is a wasteful number, since it uses less digits than its factorization.

72781036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1081 (or 1079 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 72781036 is about 8531.1802231579. The cubic root of 72781036 is about 417.5156359258.

The spelling of 72781036 in words is "seventy-two million, seven hundred eighty-one thousand, thirty-six".