857649936 has 240 divisors, whose sum is σ = 2702313152. Its totient is φ = 232657920.

The previous prime is 857649929. The next prime is 857649943. The reversal of 857649936 is 639946758.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (857649929) and next prime (857649943).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2793495 + ... + 2793801.

Almost surely, 2^857649936 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 857649936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1351156576).

857649936 is an abundant number, since it is smaller than the sum of its proper divisors (1844663216).

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

857649936 is a wasteful number, since it uses less digits than its factorization.

857649936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390 (or 373 counting only the distinct ones).

The product of its digits is 9797760, while the sum is 57.

The square root of 857649936 is about 29285.6609281744. The cubic root of 857649936 is about 950.1015352233.

The spelling of 857649936 in words is "eight hundred fifty-seven million, six hundred forty-nine thousand, nine hundred thirty-six".