642006025 has 12 divisors (see below), whose sum is σ = 796403392. Its totient is φ = 513401040.

The previous prime is 642006017. The next prime is 642006049. The reversal of 642006025 is 520600246.

It is not a de Polignac number, because 642006025 - 2³ = 642006017 is a prime.

It is a super-2 number, since 2×642006025² = 824343472272601250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 111364 + ... + 116986.

Almost surely, 2^642006025 is an apocalyptic number.

It is an amenable number.

642006025 is a deficient number, since it is larger than the sum of its proper divisors (154397367).

642006025 is a wasteful number, since it uses less digits than its factorization.

642006025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10200 (or 10195 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 642006025 is about 25337.8378122523. The cubic root of 642006025 is about 862.6733223058.

It can be divided in two parts, 64200 and 6025, that added together give a square (70225 = 265²).

The spelling of 642006025 in words is "six hundred forty-two million, six thousand, twenty-five".