642511454 has 16 divisors (see below), whose sum is σ = 1038323328. Its totient is φ = 296423712.

The previous prime is 642511453. The next prime is 642511511. The reversal of 642511454 is 454115246.

It is a self number, because there is not a number n which added to its sum of digits gives 642511454.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642511453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112844 + ... + 118400.

It is an arithmetic number, because the mean of its divisors is an integer number (64895208).

Almost surely, 2^642511454 is an apocalyptic number.

642511454 is a deficient number, since it is larger than the sum of its proper divisors (395811874).

642511454 is a wasteful number, since it uses less digits than its factorization.

642511454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10019.

The product of its digits is 19200, while the sum is 32.

The square root of 642511454 is about 25347.8096489618. The cubic root of 642511454 is about 862.8996471514.

The spelling of 642511454 in words is "six hundred forty-two million, five hundred eleven thousand, four hundred fifty-four".