2278478779920 has 160 divisors (see below), whose sum is σ = 8969249859840. Its totient is φ = 520795146240.

The previous prime is 2278478779867. The next prime is 2278478779921. The reversal of 2278478779920 is 299778748722.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is not an unprimeable number, because it can be changed into a prime (2278478779921) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 75331401 + ... + 75361640.

It is an arithmetic number, because the mean of its divisors is an integer number (56057811624).

Almost surely, 2^{2278478779920} is an apocalyptic number.

2278478779920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2278478779920 is an abundant number, since it is smaller than the sum of its proper divisors (6690771079920).

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

2278478779920 is a wasteful number, since it uses less digits than its factorization.

2278478779920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150693070 (or 150693058 counting only the distinct ones).

The product of its (nonzero) digits is 398297088, while the sum is 72.

The spelling of 2278478779920 in words is "two trillion, two hundred seventy-eight billion, four hundred seventy-eight million, seven hundred seventy-nine thousand, nine hundred twenty".