72074997881 has 4 divisors (see below), whose sum is σ = 72437184000. Its totient is φ = 71712811764.

The previous prime is 72074997853. The next prime is 72074997901. The reversal of 72074997881 is 18879947027.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72074997881 - 2⁶ = 72074997817 is a prime.

It is a super-2 number, since 2×72074997881² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (72074990881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 181092761 + ... + 181093158.

It is an arithmetic number, because the mean of its divisors is an integer number (18109296000).

Almost surely, 2^72074997881 is an apocalyptic number.

It is an amenable number.

72074997881 is a deficient number, since it is larger than the sum of its proper divisors (362186119).

72074997881 is a wasteful number, since it uses less digits than its factorization.

72074997881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362186118.

The product of its (nonzero) digits is 14224896, while the sum is 62.

The spelling of 72074997881 in words is "seventy-two billion, seventy-four million, nine hundred ninety-seven thousand, eight hundred eighty-one".