642617450 has 24 divisors (see below), whose sum is σ = 1212109920. Its totient is φ = 253425200.

The previous prime is 642617431. The next prime is 642617453. The reversal of 642617450 is 54716246.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 642617450.

It is not an unprimeable number, because it can be changed into a prime (642617453) by changing a digit.

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 in 11 ways as a sum of consecutive naturals, for example, 86960 + ... + 94059.

It is an arithmetic number, because the mean of its divisors is an integer number (50504580).

Almost surely, 2^642617450 is an apocalyptic number.

642617450 is a deficient number, since it is larger than the sum of its proper divisors (569492470).

642617450 is a wasteful number, since it uses less digits than its factorization.

642617450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181102 (or 181097 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 642617450 is about 25349.9003942816. The cubic root of 642617450 is about 862.9470957903.

The spelling of 642617450 in words is "six hundred forty-two million, six hundred seventeen thousand, four hundred fifty".