642458761 has 16 divisors (see below), whose sum is σ = 782208000. Its totient is φ = 515401488.

The previous prime is 642458759. The next prime is 642458777. The reversal of 642458761 is 167854246.

It is not a de Polignac number, because 642458761 - 2¹ = 642458759 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642458711) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18061 + ... + 40138.

It is an arithmetic number, because the mean of its divisors is an integer number (48888000).

Almost surely, 2^642458761 is an apocalyptic number.

It is an amenable number.

642458761 is a deficient number, since it is larger than the sum of its proper divisors (139749239).

642458761 is a wasteful number, since it uses less digits than its factorization.

642458761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58308.

The product of its digits is 322560, while the sum is 43.

The square root of 642458761 is about 25346.7702281770. The cubic root of 642458761 is about 862.8760574220.

The spelling of 642458761 in words is "six hundred forty-two million, four hundred fifty-eight thousand, seven hundred sixty-one".