1964778392 has 16 divisors (see below), whose sum is σ = 3712968960. Its totient is φ = 974653344.

The previous prime is 1964778379. The next prime is 1964778437. The reversal of 1964778392 is 2938774691.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 965903 + ... + 967934.

It is an arithmetic number, because the mean of its divisors is an integer number (232060560).

Almost surely, 2^1964778392 is an apocalyptic number.

It is an amenable number.

1964778392 is a deficient number, since it is larger than the sum of its proper divisors (1748190568).

1964778392 is a wasteful number, since it uses less digits than its factorization.

1964778392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1933970 (or 1933966 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 56.

The square root of 1964778392 is about 44325.8208271432. The cubic root of 1964778392 is about 1252.4811289011.

The spelling of 1964778392 in words is "one billion, nine hundred sixty-four million, seven hundred seventy-eight thousand, three hundred ninety-two".