642625435 has 16 divisors (see below), whose sum is σ = 793144512. Its totient is φ = 499478400.

The previous prime is 642625433. The next prime is 642625439. The reversal of 642625435 is 534526246.

It is not a de Polignac number, because 642625435 - 2¹ = 642625433 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 642625394 and 642625403.

It is not an unprimeable number, because it can be changed into a prime (642625433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 149770 + ... + 154000.

It is an arithmetic number, because the mean of its divisors is an integer number (49571532).

Almost surely, 2^642625435 is an apocalyptic number.

642625435 is a deficient number, since it is larger than the sum of its proper divisors (150519077).

642625435 is a wasteful number, since it uses less digits than its factorization.

642625435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5094.

The product of its digits is 172800, while the sum is 37.

The square root of 642625435 is about 25350.0578894803. The cubic root of 642625435 is about 862.9506700288.

The spelling of 642625435 in words is "six hundred forty-two million, six hundred twenty-five thousand, four hundred thirty-five".