642019716 has 48 divisors (see below), whose sum is σ = 1792537600. Its totient is φ = 197544096.

The previous prime is 642019699. The next prime is 642019717. The reversal of 642019716 is 617910246.

642019716 is a `hidden beast` number, since 642 + 0 + 1 + 9 + 7 + 1 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (642019717) 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 15 ways as a sum of consecutive naturals, for example, 227236 + ... + 230043.

Almost surely, 2^642019716 is an apocalyptic number.

It is an amenable number.

642019716 is an abundant number, since it is smaller than the sum of its proper divisors (1150517884).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642019716 is a wasteful number, since it uses less digits than its factorization.

642019716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457305 (or 457297 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 642019716 is about 25338.1079798788. The cubic root of 642019716 is about 862.6794545310.

The spelling of 642019716 in words is "six hundred forty-two million, nineteen thousand, seven hundred sixteen".