87213457 has 2 divisors, whose sum is σ = 87213458. Its totient is φ = 87213456.

The previous prime is 87213443. The next prime is 87213479. The reversal of 87213457 is 75431278.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72437121 + 14776336 = 8511^2 + 3844^2 .

It is a cyclic number.

It is not a de Polignac number, because 87213457 - 2²³ = 78824849 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87213157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43606728 + 43606729.

It is an arithmetic number, because the mean of its divisors is an integer number (43606729).

Almost surely, 2^87213457 is an apocalyptic number.

It is an amenable number.

87213457 is a deficient number, since it is larger than the sum of its proper divisors (1).

87213457 is an equidigital number, since it uses as much as digits as its factorization.

87213457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47040, while the sum is 37.

The square root of 87213457 is about 9338.8145393299. The cubic root of 87213457 is about 443.4668562835.

The spelling of 87213457 in words is "eighty-seven million, two hundred thirteen thousand, four hundred fifty-seven".