642005270 has 16 divisors (see below), whose sum is σ = 1161479088. Its totient is φ = 255497760.

The previous prime is 642005251. The next prime is 642005293. The reversal of 642005270 is 72500246.

It is a congruent number.

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, 160976 + ... + 164915.

It is an arithmetic number, because the mean of its divisors is an integer number (72592443).

Almost surely, 2^642005270 is an apocalyptic number.

642005270 is a deficient number, since it is larger than the sum of its proper divisors (519473818).

642005270 is a wasteful number, since it uses less digits than its factorization.

642005270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326095.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 642005270 is about 25337.8229135812. The cubic root of 642005270 is about 862.6729841373.

The spelling of 642005270 in words is "six hundred forty-two million, five thousand, two hundred seventy".