642260421 has 48 divisors (see below), whose sum is σ = 1054941888. Its totient is φ = 387244800.

The previous prime is 642260389. The next prime is 642260429. The reversal of 642260421 is 124062246.

It is not a de Polignac number, because 642260421 - 2⁵ = 642260389 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642260429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 643695 + ... + 644691.

It is an arithmetic number, because the mean of its divisors is an integer number (21977956).

Almost surely, 2^642260421 is an apocalyptic number.

It is an amenable number.

642260421 is a deficient number, since it is larger than the sum of its proper divisors (412681467).

642260421 is a wasteful number, since it uses less digits than its factorization.

642260421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1264 (or 1252 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 642260421 is about 25342.8573961185. The cubic root of 642260421 is about 862.7872525251.

The spelling of 642260421 in words is "six hundred forty-two million, two hundred sixty thousand, four hundred twenty-one".