1681792920 has 48 divisors (see below), whose sum is σ = 5465828160. Its totient is φ = 448478016.

The previous prime is 1681792919. The next prime is 1681792921. The reversal of 1681792920 is 292971861.

1681792920 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1681792919) and next prime (1681792921).

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681792921) 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, 2335464 + ... + 2336183.

It is an arithmetic number, because the mean of its divisors is an integer number (113871420).

Almost surely, 2^1681792920 is an apocalyptic number.

1681792920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1681792920 is an abundant number, since it is smaller than the sum of its proper divisors (3784035240).

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

1681792920 is a wasteful number, since it uses less digits than its factorization.

1681792920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4671664 (or 4671657 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 1681792920 is about 41009.6686160715. The cubic root of 1681792920 is about 1189.2071360963.

The spelling of 1681792920 in words is "one billion, six hundred eighty-one million, seven hundred ninety-two thousand, nine hundred twenty".