1992900078 has 32 divisors (see below), whose sum is σ = 4769335200. Its totient is φ = 613199808.

The previous prime is 1992900061. The next prime is 1992900127. The reversal of 1992900078 is 8700092991.

It is a congruent number.

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, 1418743 + ... + 1420146.

It is an arithmetic number, because the mean of its divisors is an integer number (149041725).

Almost surely, 2^1992900078 is an apocalyptic number.

1992900078 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1992900078 is an abundant number, since it is smaller than the sum of its proper divisors (2776435122).

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

1992900078 is a wasteful number, since it uses less digits than its factorization.

1992900078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2838913 (or 2838907 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 45.

The square root of 1992900078 is about 44641.9094349693. The cubic root of 1992900078 is about 1258.4283920098.

The spelling of 1992900078 in words is "one billion, nine hundred ninety-two million, nine hundred thousand, seventy-eight".