72909456 has 20 divisors (see below), whose sum is σ = 188349552. Its totient is φ = 24303136.

The previous prime is 72909437. The next prime is 72909461. The reversal of 72909456 is 65490927.

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

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, 759426 + ... + 759521.

Almost surely, 2^72909456 is an apocalyptic number.

It is an amenable number.

72909456 is an abundant number, since it is smaller than the sum of its proper divisors (115440096).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72909456 is a wasteful number, since it uses less digits than its factorization.

72909456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1518958 (or 1518952 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 42.

The square root of 72909456 is about 8538.7034144535. The cubic root of 72909456 is about 417.7610563282.

The spelling of 72909456 in words is "seventy-two million, nine hundred nine thousand, four hundred fifty-six".