642419715 has 128 divisors (see below), whose sum is σ = 1304875008. Its totient is φ = 263208960.

The previous prime is 642419689. The next prime is 642419717. The reversal of 642419715 is 517914246.

It is a Cunningham number, because it is equal to 25346²-1.

It is not a de Polignac number, because 642419715 - 2⁷ = 642419587 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642419717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 4689127 + ... + 4689263.

It is an arithmetic number, because the mean of its divisors is an integer number (10194336).

Almost surely, 2^642419715 is an apocalyptic number.

642419715 is an abundant number, since it is smaller than the sum of its proper divisors (662455293).

642419715 is a wasteful number, since it uses less digits than its factorization.

642419715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277.

The product of its digits is 60480, while the sum is 39.

The square root of 642419715 is about 25345.9999802730. Note that the first 4 decimals coincide. The cubic root of 642419715 is about 862.8585763824.

The spelling of 642419715 in words is "six hundred forty-two million, four hundred nineteen thousand, seven hundred fifteen".