642909000 has 192 divisors, whose sum is σ = 2081963520. Its totient is φ = 165168000.

The previous prime is 642908999. The next prime is 642909049. The reversal of 642909000 is 909246.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

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, 2882889 + ... + 2883111.

It is an arithmetic number, because the mean of its divisors is an integer number (10843560).

Almost surely, 2^642909000 is an apocalyptic number.

642909000 is a gapful number since it is divisible by the number (60) 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 642909000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1040981760).

642909000 is an abundant number, since it is smaller than the sum of its proper divisors (1439054520).

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

642909000 is a wasteful number, since it uses less digits than its factorization.

642909000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309 (or 264 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 642909000 is about 25355.6502578814. The cubic root of 642909000 is about 863.0775799464.

The spelling of 642909000 in words is "six hundred forty-two million, nine hundred nine thousand".