2555863920 has 60 divisors (see below), whose sum is σ = 8583445416. Its totient is φ = 681563520.

The previous prime is 2555863897. The next prime is 2555863927. The reversal of 2555863920 is 293685552.

2555863920 is a `hidden beast` number, since 2 + 5 + 5 + 5 + 8 + 639 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (60).

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 (2555863927) 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, 1774186 + ... + 1775625.

Almost surely, 2^2555863920 is an apocalyptic number.

2555863920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2555863920 is an abundant number, since it is smaller than the sum of its proper divisors (6027581496).

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

2555863920 is a wasteful number, since it uses less digits than its factorization.

2555863920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3549830 (or 3549821 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 45.

The square root of 2555863920 is about 50555.5528107447. The cubic root of 2555863920 is about 1367.2436313311.

The spelling of 2555863920 in words is "two billion, five hundred fifty-five million, eight hundred sixty-three thousand, nine hundred twenty".