642102444 has 48 divisors (see below), whose sum is σ = 1762639200. Its totient is φ = 201443328.

The previous prime is 642102443. The next prime is 642102493. The reversal of 642102444 is 444201246.

It is a happy number.

642102444 is a `hidden beast` number, since 6 + 4 + 210 + 2 + 444 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (642102443) 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, 173029 + ... + 176700.

It is an arithmetic number, because the mean of its divisors is an integer number (36721650).

Almost surely, 2^642102444 is an apocalyptic number.

It is an amenable number.

642102444 is an abundant number, since it is smaller than the sum of its proper divisors (1120536756).

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

642102444 is a wasteful number, since it uses less digits than its factorization.

642102444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349759 (or 349751 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

The square root of 642102444 is about 25339.7404090886. The cubic root of 642102444 is about 862.7165067060.

The spelling of 642102444 in words is "six hundred forty-two million, one hundred two thousand, four hundred forty-four".