642640454 has 16 divisors (see below), whose sum is σ = 979757856. Its totient is φ = 316075200.

The previous prime is 642640441. The next prime is 642640487. The reversal of 642640454 is 454046246.

642640454 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×642640454² = 825973506234652232, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60554 + ... + 70370.

It is an arithmetic number, because the mean of its divisors is an integer number (61234866).

Almost surely, 2^642640454 is an apocalyptic number.

642640454 is a deficient number, since it is larger than the sum of its proper divisors (337117402).

642640454 is a wasteful number, since it uses less digits than its factorization.

642640454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10351.

The product of its (nonzero) digits is 92160, while the sum is 35.

The square root of 642640454 is about 25350.3541198146. The cubic root of 642640454 is about 862.9573927397.

The spelling of 642640454 in words is "six hundred forty-two million, six hundred forty thousand, four hundred fifty-four".