858020640 has 96 divisors (see below), whose sum is σ = 2711874816. Its totient is φ = 228034560.

The previous prime is 858020633. The next prime is 858020701. The reversal of 858020640 is 46020858.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 147385 + ... + 153095.

It is an arithmetic number, because the mean of its divisors is an integer number (28248696).

Almost surely, 2^858020640 is an apocalyptic number.

858020640 is a gapful number since it is divisible by the number (80) 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 858020640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1355937408).

858020640 is an abundant number, since it is smaller than the sum of its proper divisors (1853854176).

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

858020640 is a wasteful number, since it uses less digits than its factorization.

858020640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6042 (or 6034 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 33.

The square root of 858020640 is about 29291.9893486257. The cubic root of 858020640 is about 950.2384036945.

The spelling of 858020640 in words is "eight hundred fifty-eight million, twenty thousand, six hundred forty".