278916979770 has 384 divisors, whose sum is σ = 899113374720. Its totient is φ = 60958759680.

The previous prime is 278916979763. The next prime is 278916979793. The reversal of 278916979770 is 77979619872.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 21576529 + ... + 21589451.

It is an arithmetic number, because the mean of its divisors is an integer number (2341441080).

Almost surely, 2^278916979770 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 278916979770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (449556687360).

278916979770 is an abundant number, since it is smaller than the sum of its proper divisors (620196394950).

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

278916979770 is a wasteful number, since it uses less digits than its factorization.

278916979770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13019 (or 13000 counting only the distinct ones).

The product of its (nonzero) digits is 168031584, while the sum is 72.

The spelling of 278916979770 in words is "two hundred seventy-eight billion, nine hundred sixteen million, nine hundred seventy-nine thousand, seven hundred seventy".