87507697489 has 9 divisors (see below), whose sum is σ = 92963346321. Its totient is φ = 82355452800.

The previous prime is 87507697469. The next prime is 87507697553. The reversal of 87507697489 is 98479670578.

The square root of 87507697489 is 295817.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 12317670225 + 75190027264 = 110985^2 + 274208^2 .

It is not a de Polignac number, because 87507697489 - 2⁹ = 87507696977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87507697469) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5020189 + ... + 5037589.

Almost surely, 2^87507697489 is an apocalyptic number.

87507697489 is the 295817-th square number.

87507697489 is the 147909-th centered octagonal number.

It is an amenable number.

87507697489 is a deficient number, since it is larger than the sum of its proper divisors (5455648832).

87507697489 is an frugal number, since it uses more digits than its factorization.

87507697489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34836 (or 17418 counting only the distinct ones).

The product of its (nonzero) digits is 213373440, while the sum is 70.

It can be divided in two parts, 87507 and 697489, that added together give a square (784996 = 886²).

The spelling of 87507697489 in words is "eighty-seven billion, five hundred seven million, six hundred ninety-seven thousand, four hundred eighty-nine".