87645457 has 2 divisors, whose sum is σ = 87645458. Its totient is φ = 87645456.

The previous prime is 87645451. The next prime is 87645469. The reversal of 87645457 is 75454678.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82609921 + 5035536 = 9089^2 + 2244^2 .

It is a cyclic number.

It is not a de Polignac number, because 87645457 - 2¹⁵ = 87612689 is a prime.

It is a super-2 number, since 2×87645457² = 15363452265477698, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (87645451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43822728 + 43822729.

It is an arithmetic number, because the mean of its divisors is an integer number (43822729).

Almost surely, 2^87645457 is an apocalyptic number.

It is an amenable number.

87645457 is a deficient number, since it is larger than the sum of its proper divisors (1).

87645457 is an equidigital number, since it uses as much as digits as its factorization.

87645457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 940800, while the sum is 46.

The square root of 87645457 is about 9361.9152420859. The cubic root of 87645457 is about 444.1978682095.

The spelling of 87645457 in words is "eighty-seven million, six hundred forty-five thousand, four hundred fifty-seven".