72909477 has 28 divisors (see below), whose sum is σ = 110489184. Its totient is φ = 48084840.

The previous prime is 72909469. The next prime is 72909497. The reversal of 72909477 is 77490927.

It is a happy number.

It is not a de Polignac number, because 72909477 - 2³ = 72909469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72909437) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 74602 + ... + 75572.

Almost surely, 2^72909477 is an apocalyptic number.

It is an amenable number.

72909477 is a deficient number, since it is larger than the sum of its proper divisors (37579707).

72909477 is an equidigital number, since it uses as much as digits as its factorization.

72909477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1092 (or 1077 counting only the distinct ones).

The product of its (nonzero) digits is 222264, while the sum is 45.

The square root of 72909477 is about 8538.7046441483. The cubic root of 72909477 is about 417.7610964372.

The spelling of 72909477 in words is "seventy-two million, nine hundred nine thousand, four hundred seventy-seven".