19642776804 has 72 divisors (see below), whose sum is σ = 59240136480. Its totient is φ = 5612220432.

The previous prime is 19642776781. The next prime is 19642776817. The reversal of 19642776804 is 40867724691.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1850602 + ... + 1861185.

Almost surely, 2^19642776804 is an apocalyptic number.

19642776804 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

19642776804 is an abundant number, since it is smaller than the sum of its proper divisors (39597359676).

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

19642776804 is a wasteful number, since it uses less digits than its factorization.

19642776804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3711814 (or 3711799 counting only the distinct ones).

The product of its (nonzero) digits is 4064256, while the sum is 54.

The spelling of 19642776804 in words is "nineteen billion, six hundred forty-two million, seven hundred seventy-six thousand, eight hundred four".