2775993978 has 32 divisors (see below), whose sum is σ = 5663155392. Its totient is φ = 906912000.

The previous prime is 2775993967. The next prime is 2775994021. The reversal of 2775993978 is 8793995772.

It is a super-2 number, since 2×2775993978² = 15412285131784528968, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90178 + ... + 116978.

It is an arithmetic number, because the mean of its divisors is an integer number (176973606).

Almost surely, 2^2775993978 is an apocalyptic number.

2775993978 is an abundant number, since it is smaller than the sum of its proper divisors (2887161414).

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

2775993978 is a wasteful number, since it uses less digits than its factorization.

2775993978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27150.

The product of its digits is 60011280, while the sum is 66.

The square root of 2775993978 is about 52687.7023412485. The cubic root of 2775993978 is about 1405.4201414030.

The spelling of 2775993978 in words is "two billion, seven hundred seventy-five million, nine hundred ninety-three thousand, nine hundred seventy-eight".