2085215780 has 24 divisors (see below), whose sum is σ = 4419131640. Its totient is φ = 826433280.

The previous prime is 2085215779. The next prime is 2085215789. The reversal of 2085215780 is 875125802.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 756030016 + 1329185764 = 27496^2 + 36458^2 .

It is a super-2 number, since 2×2085215780² = 8696249698322016800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2085215789) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 476081 + ... + 480440.

It is an arithmetic number, because the mean of its divisors is an integer number (184130485).

Almost surely, 2^2085215780 is an apocalyptic number.

2085215780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2085215780 is an abundant number, since it is smaller than the sum of its proper divisors (2333915860).

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

2085215780 is a wasteful number, since it uses less digits than its factorization.

2085215780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 956639 (or 956637 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 38.

The square root of 2085215780 is about 45664.1629727295. The cubic root of 2085215780 is about 1277.5669479559.

The spelling of 2085215780 in words is "two billion, eighty-five million, two hundred fifteen thousand, seven hundred eighty".