642695379 has 8 divisors (see below), whose sum is σ = 884570112. Its totient is φ = 414642120.

The previous prime is 642695369. The next prime is 642695381. The reversal of 642695379 is 973596246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 642695379 - 2⁹ = 642694867 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642695309) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3455259 + ... + 3455444.

It is an arithmetic number, because the mean of its divisors is an integer number (110571264).

Almost surely, 2^642695379 is an apocalyptic number.

642695379 is a deficient number, since it is larger than the sum of its proper divisors (241874733).

642695379 is a wasteful number, since it uses less digits than its factorization.

642695379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6910737.

The product of its digits is 2449440, while the sum is 51.

The square root of 642695379 is about 25351.4374148686. The cubic root of 642695379 is about 862.9819770332.

The spelling of 642695379 in words is "six hundred forty-two million, six hundred ninety-five thousand, three hundred seventy-nine".