899706640 has 240 divisors, whose sum is σ = 2693077632. Its totient is φ = 277229568.

The previous prime is 899706593. The next prime is 899706667. The reversal of 899706640 is 46607998.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1532427 + ... + 1533013.

Almost surely, 2^899706640 is an apocalyptic number.

899706640 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 899706640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1346538816).

899706640 is an abundant number, since it is smaller than the sum of its proper divisors (1793370992).

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

899706640 is a wasteful number, since it uses less digits than its factorization.

899706640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654 (or 641 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 49.

The square root of 899706640 is about 29995.1102681754. The cubic root of 899706640 is about 965.3844709962.

The spelling of 899706640 in words is "eight hundred ninety-nine million, seven hundred six thousand, six hundred forty".