858266640 has 480 divisors, whose sum is σ = 3651837696. Its totient is φ = 175472640.

The previous prime is 858266609. The next prime is 858266657. The reversal of 858266640 is 46662858.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 6264652 + ... + 6264788.

Almost surely, 2^858266640 is an apocalyptic number.

858266640 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 858266640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1825918848).

858266640 is an abundant number, since it is smaller than the sum of its proper divisors (2793571056).

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

858266640 is a wasteful number, since it uses less digits than its factorization.

858266640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287 (or 278 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 45.

The square root of 858266640 is about 29296.1881479485. The cubic root of 858266640 is about 950.3292081577.

The spelling of 858266640 in words is "eight hundred fifty-eight million, two hundred sixty-six thousand, six hundred forty".