642096819 has 96 divisors (see below), whose sum is σ = 1207664640. Its totient is φ = 319486464.

The previous prime is 642096761. The next prime is 642096821. The reversal of 642096819 is 918690246.

It is a happy number.

It is not a de Polignac number, because 642096819 - 2⁷ = 642096691 is a prime.

It is a super-2 number, since 2×642096819² = 824576649939837522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (642096869) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1676302 + ... + 1676684.

It is an arithmetic number, because the mean of its divisors is an integer number (12579840).

Almost surely, 2^642096819 is an apocalyptic number.

642096819 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

642096819 is a deficient number, since it is larger than the sum of its proper divisors (565567821).

642096819 is a wasteful number, since it uses less digits than its factorization.

642096819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521 (or 518 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 642096819 is about 25339.6294171797. The cubic root of 642096819 is about 862.7139874847.

It can be divided in two parts, 642096 and 819, that multiplied together give a square (525876624 = 22932²).

The spelling of 642096819 in words is "six hundred forty-two million, ninety-six thousand, eight hundred nineteen".