642667874 has 16 divisors (see below), whose sum is σ = 1000273848. Its totient is φ = 309422592.

The previous prime is 642667873. The next prime is 642667889. The reversal of 642667874 is 478766246.

It can be written as a sum of positive squares in 4 ways, for example, as 634687249 + 7980625 = 25193^2 + 2825^2 .

It is not an unprimeable number, because it can be changed into a prime (642667871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37589 + ... + 51944.

Almost surely, 2^642667874 is an apocalyptic number.

642667874 is a deficient number, since it is larger than the sum of its proper divisors (357605974).

642667874 is a wasteful number, since it uses less digits than its factorization.

642667874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89669.

The product of its digits is 2709504, while the sum is 50.

The square root of 642667874 is about 25350.8949348933. The cubic root of 642667874 is about 862.9696660386.

The spelling of 642667874 in words is "six hundred forty-two million, six hundred sixty-seven thousand, eight hundred seventy-four".