72929581 has 6 divisors (see below), whose sum is σ = 76970382. Its totient is φ = 69090840.

The previous prime is 72929579. The next prime is 72929599. The reversal of 72929581 is 18592927.

It can be written as a sum of positive squares in only one way, i.e., 61873956 + 11055625 = 7866^2 + 3325^2 .

It is not a de Polignac number, because 72929581 - 2¹ = 72929579 is a prime.

It is a super-2 number, since 2×72929581² = 10637447569671122, 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 (72929531) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 100650 + ... + 101371.

It is an arithmetic number, because the mean of its divisors is an integer number (12828397).

Almost surely, 2^72929581 is an apocalyptic number.

It is an amenable number.

72929581 is a deficient number, since it is larger than the sum of its proper divisors (4040801).

72929581 is a wasteful number, since it uses less digits than its factorization.

72929581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202059 (or 202040 counting only the distinct ones).

The product of its digits is 90720, while the sum is 43.

The square root of 72929581 is about 8539.8817907510. The cubic root of 72929581 is about 417.7994906104.

The spelling of 72929581 in words is "seventy-two million, nine hundred twenty-nine thousand, five hundred eighty-one".