642920015 has 8 divisors (see below), whose sum is σ = 771745968. Its totient is φ = 514174720.

The previous prime is 642920011. The next prime is 642920021. The reversal of 642920015 is 510029246.

It is a happy number.

642920015 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 642920015 - 2² = 642920011 is a prime.

It is a super-2 number, since 2×642920015² = 826692291375200450, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 642920015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642920011) 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, 962 + ... + 35871.

It is an arithmetic number, because the mean of its divisors is an integer number (96468246).

Almost surely, 2^642920015 is an apocalyptic number.

642920015 is a deficient number, since it is larger than the sum of its proper divisors (128825953).

642920015 is a wasteful number, since it uses less digits than its factorization.

642920015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40329.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 642920015 is about 25355.8674669198. The cubic root of 642920015 is about 863.0825089722.

The spelling of 642920015 in words is "six hundred forty-two million, nine hundred twenty thousand, fifteen".