642980515 has 8 divisors (see below), whose sum is σ = 771719328. Its totient is φ = 514289280.

The previous prime is 642980483. The next prime is 642980519. The reversal of 642980515 is 515089246.

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

It is not a de Polignac number, because 642980515 - 2⁵ = 642980483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642980519) 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, 33819 + ... + 49291.

It is an arithmetic number, because the mean of its divisors is an integer number (96464916).

Almost surely, 2^642980515 is an apocalyptic number.

642980515 is a deficient number, since it is larger than the sum of its proper divisors (128738813).

642980515 is a wasteful number, since it uses less digits than its factorization.

642980515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23789.

The product of its (nonzero) digits is 86400, while the sum is 40.

The square root of 642980515 is about 25357.0604566066. The cubic root of 642980515 is about 863.1095806933.

The spelling of 642980515 in words is "six hundred forty-two million, nine hundred eighty thousand, five hundred fifteen".