72997905 has 16 divisors (see below), whose sum is σ = 122944320. Its totient is φ = 36883008.

The previous prime is 72997877. The next prime is 72997933. The reversal of 72997905 is 50979927.

It is an interprime number because it is at equal distance from previous prime (72997877) and next prime (72997933).

It is not a de Polignac number, because 72997905 - 2¹⁰ = 72996881 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127782 + ... + 128351.

It is an arithmetic number, because the mean of its divisors is an integer number (7684020).

Almost surely, 2^72997905 is an apocalyptic number.

It is an amenable number.

72997905 is a deficient number, since it is larger than the sum of its proper divisors (49946415).

72997905 is a wasteful number, since it uses less digits than its factorization.

72997905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256160.

The product of its (nonzero) digits is 357210, while the sum is 48.

The square root of 72997905 is about 8543.8811438362. The cubic root of 72997905 is about 417.9299215562.

The spelling of 72997905 in words is "seventy-two million, nine hundred ninety-seven thousand, nine hundred five".