2051115780 has 48 divisors (see below), whose sum is σ = 6563571840. Its totient is φ = 468826368.

The previous prime is 2051115779. The next prime is 2051115809. The reversal of 2051115780 is 875111502.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 2441385 + ... + 2442224.

It is an arithmetic number, because the mean of its divisors is an integer number (136741080).

Almost surely, 2^2051115780 is an apocalyptic number.

2051115780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2051115780 is an abundant number, since it is smaller than the sum of its proper divisors (4512456060).

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

2051115780 is a wasteful number, since it uses less digits than its factorization.

2051115780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4883628 (or 4883626 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 30.

The square root of 2051115780 is about 45289.2457433329. The cubic root of 2051115780 is about 1270.5645246902.

The spelling of 2051115780 in words is "two billion, fifty-one million, one hundred fifteen thousand, seven hundred eighty".