2780138880 has 96 divisors (see below), whose sum is σ = 9600186960. Its totient is φ = 741368832.

The previous prime is 2780138863. The next prime is 2780138917. The reversal of 2780138880 is 888310872.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 235572 + ... + 247091.

Almost surely, 2^2780138880 is an apocalyptic number.

2780138880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2780138880 is an abundant number, since it is smaller than the sum of its proper divisors (6820048080).

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

2780138880 is a wasteful number, since it uses less digits than its factorization.

2780138880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482688 (or 482673 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 45.

The square root of 2780138880 is about 52727.0222940761. The cubic root of 2780138880 is about 1406.1192821903.

The spelling of 2780138880 in words is "two billion, seven hundred eighty million, one hundred thirty-eight thousand, eight hundred eighty".