72497857 has 2 divisors, whose sum is σ = 72497858. Its totient is φ = 72497856.

The previous prime is 72497851. The next prime is 72497879. The reversal of 72497857 is 75879427.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61214976 + 11282881 = 7824^2 + 3359^2 .

It is a cyclic number.

It is not a de Polignac number, because 72497857 - 2³ = 72497849 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72497857.

It is not a weakly prime, because it can be changed into another prime (72497851) 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, 36248928 + 36248929.

It is an arithmetic number, because the mean of its divisors is an integer number (36248929).

Almost surely, 2^72497857 is an apocalyptic number.

It is an amenable number.

72497857 is a deficient number, since it is larger than the sum of its proper divisors (1).

72497857 is an equidigital number, since it uses as much as digits as its factorization.

72497857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 987840, while the sum is 49.

The square root of 72497857 is about 8514.5673407402. The cubic root of 72497857 is about 416.9734373026.

The spelling of 72497857 in words is "seventy-two million, four hundred ninety-seven thousand, eight hundred fifty-seven".