858798864 has 240 divisors, whose sum is σ = 3040412544. Its totient is φ = 219801600.

The previous prime is 858798847. The next prime is 858798887. The reversal of 858798864 is 468897858.

It is a Harshad number since it is a multiple of its sum of digits (63).

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, 808894 + ... + 809954.

Almost surely, 2^858798864 is an apocalyptic number.

858798864 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 858798864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1520206272).

858798864 is an abundant number, since it is smaller than the sum of its proper divisors (2181613680).

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

858798864 is a wasteful number, since it uses less digits than its factorization.

858798864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1166 (or 1157 counting only the distinct ones).

The product of its digits is 30965760, while the sum is 63.

The square root of 858798864 is about 29305.2702427396. The cubic root of 858798864 is about 950.5256053595.

The spelling of 858798864 in words is "eight hundred fifty-eight million, seven hundred ninety-eight thousand, eight hundred sixty-four".