2155230780 has 24 divisors (see below), whose sum is σ = 6034646352. Its totient is φ = 574728192.

The previous prime is 2155230769. The next prime is 2155230793. The reversal of 2155230780 is 870325512.

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, 17960197 + ... + 17960316.

It is an arithmetic number, because the mean of its divisors is an integer number (251443598).

Almost surely, 2^2155230780 is an apocalyptic number.

2155230780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2155230780 is an abundant number, since it is smaller than the sum of its proper divisors (3879415572).

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

2155230780 is a wasteful number, since it uses less digits than its factorization.

2155230780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35920525 (or 35920523 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 33.

The square root of 2155230780 is about 46424.4631632936. The cubic root of 2155230780 is about 1291.7087265573.

It can be divided in two parts, 215 and 5230780, that added together give a triangular number (5230995 = T₃₂₃₄).

The spelling of 2155230780 in words is "two billion, one hundred fifty-five million, two hundred thirty thousand, seven hundred eighty".