869947650 has 216 divisors, whose sum is σ = 2768924340. Its totient is φ = 194515200.

The previous prime is 869947649. The next prime is 869947667. The reversal of 869947650 is 56749968.

869947650 is a `hidden beast` number, since 86 + 99 + 476 + 5 + 0 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 433597329 + 436350321 = 20823^2 + 20889^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 707236 + ... + 708464.

Almost surely, 2^869947650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 869947650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1384462170).

869947650 is an abundant number, since it is smaller than the sum of its proper divisors (1898976690).

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

869947650 is a wasteful number, since it uses less digits than its factorization.

869947650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1282 (or 1263 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 54.

The square root of 869947650 is about 29494.8749785450. The cubic root of 869947650 is about 954.6211228821.

The spelling of 869947650 in words is "eight hundred sixty-nine million, nine hundred forty-seven thousand, six hundred fifty".