642265401 has 16 divisors (see below), whose sum is σ = 874283328. Its totient is φ = 419275200.

The previous prime is 642265399. The next prime is 642265439. The reversal of 642265401 is 104562246.

It is not a de Polignac number, because 642265401 - 2¹ = 642265399 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642265201) 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, 33811 + ... + 49271.

It is an arithmetic number, because the mean of its divisors is an integer number (54642708).

Almost surely, 2^642265401 is an apocalyptic number.

642265401 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

642265401 is a deficient number, since it is larger than the sum of its proper divisors (232017927).

642265401 is a wasteful number, since it uses less digits than its factorization.

642265401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15752.

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 642265401 is about 25342.9556484637. The cubic root of 642265401 is about 862.7894824977.

The spelling of 642265401 in words is "six hundred forty-two million, two hundred sixty-five thousand, four hundred one".