19257907878 has 24 divisors (see below), whose sum is σ = 45518691816. Its totient is φ = 5835729600.

The previous prime is 19257907873. The next prime is 19257907897. The reversal of 19257907878 is 87870975291.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19257907871) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48630883 + ... + 48631278.

It is an arithmetic number, because the mean of its divisors is an integer number (1896612159).

Almost surely, 2^19257907878 is an apocalyptic number.

19257907878 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

19257907878 is an abundant number, since it is smaller than the sum of its proper divisors (26260783938).

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

19257907878 is a wasteful number, since it uses less digits than its factorization.

19257907878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97262180 (or 97262177 counting only the distinct ones).

The product of its (nonzero) digits is 17781120, while the sum is 63.

The spelling of 19257907878 in words is "nineteen billion, two hundred fifty-seven million, nine hundred seven thousand, eight hundred seventy-eight".