87492257 has 4 divisors (see below), whose sum is σ = 87512196. Its totient is φ = 87472320.

The previous prime is 87492227. The next prime is 87492281. The reversal of 87492257 is 75229478.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75229478 = 2 ⋅37614739.

It can be written as a sum of positive squares in 2 ways, for example, as 60202081 + 27290176 = 7759^2 + 5224^2 .

It is a cyclic number.

It is not a de Polignac number, because 87492257 - 2¹⁴ = 87475873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87492227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 188 + ... + 13229.

It is an arithmetic number, because the mean of its divisors is an integer number (21878049).

Almost surely, 2^87492257 is an apocalyptic number.

It is an amenable number.

87492257 is a deficient number, since it is larger than the sum of its proper divisors (19939).

87492257 is a wasteful number, since it uses less digits than its factorization.

87492257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19938.

The product of its digits is 282240, while the sum is 44.

The square root of 87492257 is about 9353.7295770190. The cubic root of 87492257 is about 443.9389051694.

The spelling of 87492257 in words is "eighty-seven million, four hundred ninety-two thousand, two hundred fifty-seven".