642000000 has 224 divisors, whose sum is σ = 2151534960. Its totient is φ = 169600000.

The previous prime is 641999959. The next prime is 642000011. The reversal of 642000000 is 246.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 642000000.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 5999947 + ... + 6000053.

Almost surely, 2^642000000 is an apocalyptic number.

642000000 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 642000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1075767480).

642000000 is an abundant number, since it is smaller than the sum of its proper divisors (1509534960).

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

642000000 is an frugal number, since it uses more digits than its factorization.

642000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154 (or 117 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 642000000 is about 25337.7189186399. The cubic root of 642000000 is about 862.6706236691.

Adding to 642000000 its reverse (246), we get a palindrome (642000246).

The spelling of 642000000 in words is "six hundred forty-two million", and thus it is an aban number.