1928994780 has 24 divisors (see below), whose sum is σ = 5401185552. Its totient is φ = 514398592.

The previous prime is 1928994763. The next prime is 1928994799. The reversal of 1928994780 is 874998291.

It is a super-2 number, since 2×1928994780² = 7442041722534496800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1928994780.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16074897 + ... + 16075016.

It is an arithmetic number, because the mean of its divisors is an integer number (225049398).

Almost surely, 2^1928994780 is an apocalyptic number.

1928994780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1928994780 is an abundant number, since it is smaller than the sum of its proper divisors (3472190772).

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

1928994780 is a wasteful number, since it uses less digits than its factorization.

1928994780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32149925 (or 32149923 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 57.

The square root of 1928994780 is about 43920.3230862433. The cubic root of 1928994780 is about 1244.8308733019.

The spelling of 1928994780 in words is "one billion, nine hundred twenty-eight million, nine hundred ninety-four thousand, seven hundred eighty".