642715401 has 8 divisors (see below), whose sum is σ = 859216480. Its totient is φ = 427345632.

The previous prime is 642715393. The next prime is 642715417. The reversal of 642715401 is 104517246.

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

It is not a de Polignac number, because 642715401 - 2³ = 642715393 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (642715421) 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, 281500 + ... + 283773.

It is an arithmetic number, because the mean of its divisors is an integer number (107402060).

Almost surely, 2^642715401 is an apocalyptic number.

It is an amenable number.

642715401 is a deficient number, since it is larger than the sum of its proper divisors (216501079).

642715401 is a wasteful number, since it uses less digits than its factorization.

642715401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565655.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 642715401 is about 25351.8323006445. The cubic root of 642715401 is about 862.9909384822.

The spelling of 642715401 in words is "six hundred forty-two million, seven hundred fifteen thousand, four hundred one".