869778650 has 48 divisors (see below), whose sum is σ = 1844741304. Its totient is φ = 302254080.

The previous prime is 869778631. The next prime is 869778661. The reversal of 869778650 is 56877968.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 73805281 + 795973369 = 8591^2 + 28213^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28307 + ... + 50406.

Almost surely, 2^869778650 is an apocalyptic number.

869778650 is an abundant number, since it is smaller than the sum of its proper divisors (974962654).

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

869778650 is a wasteful number, since it uses less digits than its factorization.

869778650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78755 (or 78750 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 56.

The square root of 869778650 is about 29492.0099348959. The cubic root of 869778650 is about 954.5593025271.

The spelling of 869778650 in words is "eight hundred sixty-nine million, seven hundred seventy-eight thousand, six hundred fifty".