642238025 has 48 divisors (see below), whose sum is σ = 942023040. Its totient is φ = 430747200.

The previous prime is 642238021. The next prime is 642238027. The reversal of 642238025 is 520832246.

It is not a de Polignac number, because 642238025 - 2² = 642238021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 642237982 and 642238000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642238021) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 603644 + ... + 604706.

It is an arithmetic number, because the mean of its divisors is an integer number (19625480).

Almost surely, 2^642238025 is an apocalyptic number.

642238025 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

642238025 is a deficient number, since it is larger than the sum of its proper divisors (299785015).

642238025 is a wasteful number, since it uses less digits than its factorization.

642238025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1123 (or 1092 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 32.

The square root of 642238025 is about 25342.4155320680. The cubic root of 642238025 is about 862.7772237749. Note that the first 3 decimals are identical.

The spelling of 642238025 in words is "six hundred forty-two million, two hundred thirty-eight thousand, twenty-five".