72120897 has 6 divisors (see below), whose sum is σ = 104174642. Its totient is φ = 48080592.

The previous prime is 72120869. The next prime is 72120901. The reversal of 72120897 is 79802127.

It can be written as a sum of positive squares in only one way, i.e., 65950641 + 6170256 = 8121^2 + 2484^2 .

It is not a de Polignac number, because 72120897 - 2⁸ = 72120641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72120857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4006708 + ... + 4006725.

Almost surely, 2^72120897 is an apocalyptic number.

It is an amenable number.

72120897 is a deficient number, since it is larger than the sum of its proper divisors (32053745).

72120897 is a wasteful number, since it uses less digits than its factorization.

72120897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8013439 (or 8013436 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 72120897 is about 8492.4023103007. The cubic root of 72120897 is about 416.2494824548.

The spelling of 72120897 in words is "seventy-two million, one hundred twenty thousand, eight hundred ninety-seven".