642264378 has 16 divisors (see below), whose sum is σ = 1468032960. Its totient is φ = 183504096.

The previous prime is 642264361. The next prime is 642264407. The reversal of 642264378 is 873462246.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 15292009 = 642264378 / (6 + 4 + 2 + 2 + 6 + 4 + 3 + 7 + 8).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 7645963 + ... + 7646046.

It is an arithmetic number, because the mean of its divisors is an integer number (91752060).

Almost surely, 2^642264378 is an apocalyptic number.

642264378 is an abundant number, since it is smaller than the sum of its proper divisors (825768582).

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

642264378 is a wasteful number, since it uses less digits than its factorization.

642264378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15292021.

The product of its digits is 387072, while the sum is 42.

The square root of 642264378 is about 25342.9354653323. The cubic root of 642264378 is about 862.7890244139.

The spelling of 642264378 in words is "six hundred forty-two million, two hundred sixty-four thousand, three hundred seventy-eight".