642754020 has 48 divisors (see below), whose sum is σ = 1905579648. Its totient is φ = 161318400.

The previous prime is 642754009. The next prime is 642754051. The reversal of 642754020 is 20457246.

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

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, 314056 + ... + 316095.

It is an arithmetic number, because the mean of its divisors is an integer number (39699576).

Almost surely, 2^642754020 is an apocalyptic number.

642754020 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

642754020 is an abundant number, since it is smaller than the sum of its proper divisors (1262825628).

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

642754020 is a wasteful number, since it uses less digits than its factorization.

642754020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630180 (or 630178 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 30.

The square root of 642754020 is about 25352.5939501267. The cubic root of 642754020 is about 863.0082230530.

The spelling of 642754020 in words is "six hundred forty-two million, seven hundred fifty-four thousand, twenty".