87740689 has 27 divisors (see below), whose sum is σ = 101878257. Its totient is φ = 75535488.

The previous prime is 87740687. The next prime is 87740693. The reversal of 87740689 is 98604778.

The square root of 87740689 is 9367.

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 8673025 + 79067664 = 2945^2 + 8892^2 .

It is not a de Polignac number, because 87740689 - 2¹ = 87740687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87740687) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 3025527 + ... + 3025555.

Almost surely, 2^87740689 is an apocalyptic number.

87740689 is the 9367-th square number.

87740689 is the 4684-th centered octagonal number.

It is an amenable number.

87740689 is a deficient number, since it is larger than the sum of its proper divisors (14137568).

87740689 is a wasteful number, since it uses less digits than its factorization.

87740689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130 (or 65 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 49.

The cubic root of 87740689 is about 444.3586924397.

Multiplying 87740689 by its sum of digits (49), we get a square (4299293761 = 65569²).

The spelling of 87740689 in words is "eighty-seven million, seven hundred forty thousand, six hundred eighty-nine".