642625020 has 36 divisors (see below), whose sum is σ = 1949296440. Its totient is φ = 171366624.

The previous prime is 642625013. The next prime is 642625033. The reversal of 642625020 is 20526246.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1784890 + ... + 1785249.

Almost surely, 2^642625020 is an apocalyptic number.

642625020 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

642625020 is an abundant number, since it is smaller than the sum of its proper divisors (1306671420).

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

642625020 is a wasteful number, since it uses less digits than its factorization.

642625020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3570154 (or 3570149 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 642625020 is about 25350.0497040933. The cubic root of 642625020 is about 862.9504842676.

The spelling of 642625020 in words is "six hundred forty-two million, six hundred twenty-five thousand, twenty".