72903656 has 16 divisors (see below), whose sum is σ = 156222240. Its totient is φ = 31244400.

The previous prime is 72903643. The next prime is 72903671. The reversal of 72903656 is 65630927.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 650870 + ... + 650981.

It is an arithmetic number, because the mean of its divisors is an integer number (9763890).

Almost surely, 2^72903656 is an apocalyptic number.

It is an amenable number.

72903656 is an abundant number, since it is smaller than the sum of its proper divisors (83318584).

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

72903656 is a wasteful number, since it uses less digits than its factorization.

72903656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1301864 (or 1301860 counting only the distinct ones).

The product of its (nonzero) digits is 68040, while the sum is 38.

The square root of 72903656 is about 8538.3637776801. The cubic root of 72903656 is about 417.7499783030.

The spelling of 72903656 in words is "seventy-two million, nine hundred three thousand, six hundred fifty-six".