642342515 has 4 divisors (see below), whose sum is σ = 770811024. Its totient is φ = 513874008.

The previous prime is 642342497. The next prime is 642342523. The reversal of 642342515 is 515243246.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 642342515 - 2²² = 638148211 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64234247 + ... + 64234256.

It is an arithmetic number, because the mean of its divisors is an integer number (192702756).

Almost surely, 2^642342515 is an apocalyptic number.

642342515 is a deficient number, since it is larger than the sum of its proper divisors (128468509).

642342515 is a wasteful number, since it uses less digits than its factorization.

642342515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128468508.

The product of its digits is 28800, while the sum is 32.

The square root of 642342515 is about 25344.4770117673. The cubic root of 642342515 is about 862.8240115701.

The spelling of 642342515 in words is "six hundred forty-two million, three hundred forty-two thousand, five hundred fifteen".