642974094 has 48 divisors (see below), whose sum is σ = 1619130240. Its totient is φ = 180591120.

The previous prime is 642974093. The next prime is 642974113. The reversal of 642974094 is 490479246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642974093) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35812 + ... + 50679.

It is an arithmetic number, because the mean of its divisors is an integer number (33731880).

Almost surely, 2^642974094 is an apocalyptic number.

642974094 is an abundant number, since it is smaller than the sum of its proper divisors (976156146).

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

642974094 is a wasteful number, since it uses less digits than its factorization.

642974094 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86565 (or 86562 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The square root of 642974094 is about 25356.9338446114. The cubic root of 642974094 is about 863.1067075917.

The spelling of 642974094 in words is "six hundred forty-two million, nine hundred seventy-four thousand, ninety-four".