72504457 has 2 divisors, whose sum is σ = 72504458. Its totient is φ = 72504456.

The previous prime is 72504449. The next prime is 72504461. The reversal of 72504457 is 75440527.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40908816 + 31595641 = 6396^2 + 5621^2 .

It is a cyclic number.

It is not a de Polignac number, because 72504457 - 2³ = 72504449 is a prime.

It is equal to p_4256656 and since 72504457 and 4256656 have the same sum of digits, it is a Honaker prime.

It is a weakly prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36252228 + 36252229.

It is an arithmetic number, because the mean of its divisors is an integer number (36252229).

Almost surely, 2^72504457 is an apocalyptic number.

It is an amenable number.

72504457 is a deficient number, since it is larger than the sum of its proper divisors (1).

72504457 is an equidigital number, since it uses as much as digits as its factorization.

72504457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 39200, while the sum is 34.

The square root of 72504457 is about 8514.9549029927. The cubic root of 72504457 is about 416.9860902797.

The spelling of 72504457 in words is "seventy-two million, five hundred four thousand, four hundred fifty-seven".