642625434 has 64 divisors (see below), whose sum is σ = 1570930560. Its totient is φ = 194713200.

The previous prime is 642625433. The next prime is 642625439. The reversal of 642625434 is 434526246.

642625434 is a `hidden beast` number, since 642 + 6 + 2 + 5 + 4 + 3 + 4 = 666.

It is not an unprimeable number, because it can be changed into a prime (642625433) 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 31 ways as a sum of consecutive naturals, for example, 67404 + ... + 76344.

It is an arithmetic number, because the mean of its divisors is an integer number (24545790).

Almost surely, 2^642625434 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642625434, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (785465280).

642625434 is an abundant number, since it is smaller than the sum of its proper divisors (928305126).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642625434 is a wasteful number, since it uses less digits than its factorization.

642625434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8985 (or 8957 counting only the distinct ones).

The product of its digits is 138240, while the sum is 36.

The square root of 642625434 is about 25350.0578697564. The cubic root of 642625434 is about 862.9506695811.

It can be divided in two parts, 64262 and 5434, that added together give a palindrome (69696).

The spelling of 642625434 in words is "six hundred forty-two million, six hundred twenty-five thousand, four hundred thirty-four".