1978092864 has 84 divisors (see below), whose sum is σ = 6185306400. Its totient is φ = 599420160.

The previous prime is 1978092863. The next prime is 1978092889. The reversal of 1978092864 is 4682908791.

It is a self number, because there is not a number n which added to its sum of digits gives 1978092864.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978092863) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 149764 + ... + 162435.

It is an arithmetic number, because the mean of its divisors is an integer number (73634600).

Almost surely, 2^1978092864 is an apocalyptic number.

It is an amenable number.

1978092864 is an abundant number, since it is smaller than the sum of its proper divisors (4207213536).

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

1978092864 is a wasteful number, since it uses less digits than its factorization.

1978092864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312228 (or 312215 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 54.

The square root of 1978092864 is about 44475.7559126318. The cubic root of 1978092864 is about 1255.3039403950.

The spelling of 1978092864 in words is "one billion, nine hundred seventy-eight million, ninety-two thousand, eight hundred sixty-four".