72329731 has 2 divisors, whose sum is σ = 72329732. Its totient is φ = 72329730.

The previous prime is 72329717. The next prime is 72329737. The reversal of 72329731 is 13792327.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72329731 - 2¹¹ = 72327683 is a prime.

It is a super-2 number, since 2×72329731² = 10463179973064722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (72329737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36164865 + 36164866.

It is an arithmetic number, because the mean of its divisors is an integer number (36164866).

Almost surely, 2^72329731 is an apocalyptic number.

72329731 is a deficient number, since it is larger than the sum of its proper divisors (1).

72329731 is an equidigital number, since it uses as much as digits as its factorization.

72329731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15876, while the sum is 34.

The square root of 72329731 is about 8504.6887656163. The cubic root of 72329731 is about 416.6508606982.

The spelling of 72329731 in words is "seventy-two million, three hundred twenty-nine thousand, seven hundred thirty-one".