869566140 has 36 divisors (see below), whose sum is σ = 2637684504. Its totient is φ = 231884256.

The previous prime is 869566127. The next prime is 869566153. The reversal of 869566140 is 41665968.

869566140 is a `hidden beast` number, since 86 + 9 + 566 + 1 + 4 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (869566127) and next prime (869566153).

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×869566140² = 1512290543668999200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2415282 + ... + 2415641.

It is an arithmetic number, because the mean of its divisors is an integer number (73269014).

Almost surely, 2^869566140 is an apocalyptic number.

It is an amenable number.

869566140 is an abundant number, since it is smaller than the sum of its proper divisors (1768118364).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

869566140 is a wasteful number, since it uses less digits than its factorization.

869566140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4830938 (or 4830933 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 869566140 is about 29488.4068745668. The cubic root of 869566140 is about 954.4815548072.

It can be divided in two parts, 86956 and 6140, that added together give a triangular number (93096 = T₄₃₁).

The spelling of 869566140 in words is "eight hundred sixty-nine million, five hundred sixty-six thousand, one hundred forty".