642492140 has 24 divisors (see below), whose sum is σ = 1382143392. Its totient is φ = 250728320.

The previous prime is 642492139. The next prime is 642492223. The reversal of 642492140 is 41294246.

It is a super-2 number, since 2×642492140² = 825592299923559200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 642492097 and 642492106.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 390944 + ... + 392583.

It is an arithmetic number, because the mean of its divisors is an integer number (57589308).

Almost surely, 2^642492140 is an apocalyptic number.

It is an amenable number.

642492140 is an abundant number, since it is smaller than the sum of its proper divisors (739651252).

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

642492140 is a wasteful number, since it uses less digits than its factorization.

642492140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 783577 (or 783575 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 642492140 is about 25347.4286664348. The cubic root of 642492140 is about 862.8910007630.

The spelling of 642492140 in words is "six hundred forty-two million, four hundred ninety-two thousand, one hundred forty".