72870331 has 2 divisors, whose sum is σ = 72870332. Its totient is φ = 72870330.

The previous prime is 72870307. The next prime is 72870341. The reversal of 72870331 is 13307827.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72870331 - 2⁵ = 72870299 is a prime.

It is a super-2 number, since 2×72870331² = 10620170280099122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 72870293 and 72870302.

It is not a weakly prime, because it can be changed into another prime (72870341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36435165 + 36435166.

It is an arithmetic number, because the mean of its divisors is an integer number (36435166).

Almost surely, 2^72870331 is an apocalyptic number.

72870331 is a deficient number, since it is larger than the sum of its proper divisors (1).

72870331 is an equidigital number, since it uses as much as digits as its factorization.

72870331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 72870331 is about 8536.4120683107. The cubic root of 72870331 is about 417.6863160188.

The spelling of 72870331 in words is "seventy-two million, eight hundred seventy thousand, three hundred thirty-one".