1978649877274 has 32 divisors (see below), whose sum is σ = 3447758793600. Its totient is φ = 834047375040.

The previous prime is 1978649877251. The next prime is 1978649877283. The reversal of 1978649877274 is 4727789468791.

It is a junction number, because it is equal to n+sod(n) for n = 1978649877194 and 1978649877203.

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, 20053092 + ... + 20151520.

It is an arithmetic number, because the mean of its divisors is an integer number (107742462300).

Almost surely, 2^{1978649877274} is an apocalyptic number.

1978649877274 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1978649877274 is a deficient number, since it is larger than the sum of its proper divisors (1469108916326).

1978649877274 is a wasteful number, since it uses less digits than its factorization.

1978649877274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122038.

The product of its digits is 2389782528, while the sum is 79.

The spelling of 1978649877274 in words is "one trillion, nine hundred seventy-eight billion, six hundred forty-nine million, eight hundred seventy-seven thousand, two hundred seventy-four".