72887431 has 2 divisors, whose sum is σ = 72887432. Its totient is φ = 72887430.

The previous prime is 72887369. The next prime is 72887443. The reversal of 72887431 is 13478827.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72887431 - 2¹¹ = 72885383 is a prime.

It is a super-2 number, since 2×72887431² = 10625155195559522, which contains 22 as substring.

It is equal to p_4277839 and since 72887431 and 4277839 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72887461) 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 as a sum of consecutive naturals, namely, 36443715 + 36443716.

It is an arithmetic number, because the mean of its divisors is an integer number (36443716).

Almost surely, 2^72887431 is an apocalyptic number.

72887431 is a deficient number, since it is larger than the sum of its proper divisors (1).

72887431 is an equidigital number, since it uses as much as digits as its factorization.

72887431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75264, while the sum is 40.

The square root of 72887431 is about 8537.4136013198. The cubic root of 72887431 is about 417.7189853613.

The spelling of 72887431 in words is "seventy-two million, eight hundred eighty-seven thousand, four hundred thirty-one".