642051605 has 16 divisors (see below), whose sum is σ = 830484480. Its totient is φ = 473698368.

The previous prime is 642051587. The next prime is 642051617. The reversal of 642051605 is 506150246.

It is not a de Polignac number, because 642051605 - 2¹⁴ = 642035221 is a prime.

It is a congruent number.

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, 79274 + ... + 86996.

It is an arithmetic number, because the mean of its divisors is an integer number (51905280).

Almost surely, 2^642051605 is an apocalyptic number.

642051605 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

642051605 is a deficient number, since it is larger than the sum of its proper divisors (188432875).

642051605 is a wasteful number, since it uses less digits than its factorization.

642051605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9020.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 642051605 is about 25338.7372416228. The cubic root of 642051605 is about 862.6937373372.

The spelling of 642051605 in words is "six hundred forty-two million, fifty-one thousand, six hundred five".