869811840 has 96 divisors (see below), whose sum is σ = 3003588900. Its totient is φ = 231948288.

The previous prime is 869811809. The next prime is 869811911. The reversal of 869811840 is 48118968.

It can be written as a sum of positive squares in 2 ways, for example, as 757790784 + 112021056 = 27528^2 + 10584^2 .

It is a tau number, because it is divible by the number of its divisors (96).

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

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, 69745 + ... + 81264.

Almost surely, 2^869811840 is an apocalyptic number.

869811840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

869811840 is an abundant number, since it is smaller than the sum of its proper divisors (2133777060).

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

869811840 is a wasteful number, since it uses less digits than its factorization.

869811840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151034 (or 151019 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 45.

The square root of 869811840 is about 29492.5726243066. The cubic root of 869811840 is about 954.5714440914.

The spelling of 869811840 in words is "eight hundred sixty-nine million, eight hundred eleven thousand, eight hundred forty".