72891956 has 12 divisors (see below), whose sum is σ = 127764420. Its totient is φ = 36387840.

The previous prime is 72891947. The next prime is 72891977. The reversal of 72891956 is 65919827.

It can be written as a sum of positive squares in 2 ways, for example, as 47389456 + 25502500 = 6884^2 + 5050^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 72891956.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11651 + ... + 16778.

It is an arithmetic number, because the mean of its divisors is an integer number (10647035).

Almost surely, 2^72891956 is an apocalyptic number.

It is an amenable number.

72891956 is a deficient number, since it is larger than the sum of its proper divisors (54872464).

72891956 is a wasteful number, since it uses less digits than its factorization.

72891956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29074 (or 29072 counting only the distinct ones).

The product of its digits is 272160, while the sum is 47.

The square root of 72891956 is about 8537.6786072093. The cubic root of 72891956 is about 417.7276294639.

The spelling of 72891956 in words is "seventy-two million, eight hundred ninety-one thousand, nine hundred fifty-six".