642919054 has 4 divisors (see below), whose sum is σ = 964378584. Its totient is φ = 321459526.

The previous prime is 642919031. The next prime is 642919087. The reversal of 642919054 is 450919246.

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

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 642918998 and 642919016.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160729762 + ... + 160729765.

It is an arithmetic number, because the mean of its divisors is an integer number (241094646).

Almost surely, 2^642919054 is an apocalyptic number.

642919054 is a deficient number, since it is larger than the sum of its proper divisors (321459530).

642919054 is a wasteful number, since it uses less digits than its factorization.

642919054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321459529.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 642919054 is about 25355.8485166638. The cubic root of 642919054 is about 863.0820789433.

The spelling of 642919054 in words is "six hundred forty-two million, nine hundred nineteen thousand, fifty-four".