1977204878 has 16 divisors (see below), whose sum is σ = 3252372480. Its totient is φ = 894022200.

The previous prime is 1977204871. The next prime is 1977204967. The reversal of 1977204878 is 8784027791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1977204871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 231068 + ... + 239471.

It is an arithmetic number, because the mean of its divisors is an integer number (203273280).

Almost surely, 2^1977204878 is an apocalyptic number.

1977204878 is a deficient number, since it is larger than the sum of its proper divisors (1275167602).

1977204878 is a wasteful number, since it uses less digits than its factorization.

1977204878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470743.

The product of its (nonzero) digits is 1580544, while the sum is 53.

The square root of 1977204878 is about 44465.7719825036. The cubic root of 1977204878 is about 1255.1160727127.

The spelling of 1977204878 in words is "one billion, nine hundred seventy-seven million, two hundred four thousand, eight hundred seventy-eight".