72981028 has 12 divisors (see below), whose sum is σ = 127845900. Its totient is φ = 36453632.

The previous prime is 72980981. The next prime is 72981043. The reversal of 72981028 is 82018927.

It can be written as a sum of positive squares in 2 ways, for example, as 42928704 + 30052324 = 6552^2 + 5482^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4501 + ... + 12892.

It is an arithmetic number, because the mean of its divisors is an integer number (10653825).

Almost surely, 2^72981028 is an apocalyptic number.

It is an amenable number.

72981028 is a deficient number, since it is larger than the sum of its proper divisors (54864872).

72981028 is a wasteful number, since it uses less digits than its factorization.

72981028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18446 (or 18444 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 72981028 is about 8542.8934208499. The cubic root of 72981028 is about 417.8977108285.

It can be divided in two parts, 7298102 and 8, that added together give a triangular number (7298110 = T₃₈₂₀).

The spelling of 72981028 in words is "seventy-two million, nine hundred eighty-one thousand, twenty-eight".