642874654 has 4 divisors (see below), whose sum is σ = 964311984. Its totient is φ = 321437326.

The previous prime is 642874649. The next prime is 642874657. The reversal of 642874654 is 456478246.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642874657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160718662 + ... + 160718665.

It is an arithmetic number, because the mean of its divisors is an integer number (241077996).

Almost surely, 2^642874654 is an apocalyptic number.

642874654 is a deficient number, since it is larger than the sum of its proper divisors (321437330).

642874654 is a wasteful number, since it uses less digits than its factorization.

642874654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321437329.

The product of its digits is 1290240, while the sum is 46.

The square root of 642874654 is about 25354.9729638980. The cubic root of 642874654 is about 863.0622103319.

The spelling of 642874654 in words is "six hundred forty-two million, eight hundred seventy-four thousand, six hundred fifty-four".