55261840 has 40 divisors (see below), whose sum is σ = 132634368. Its totient is φ = 21390720.

The previous prime is 55261807. The next prime is 55261841. The reversal of 55261840 is 4816255.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (55261841) 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, 8662 + ... + 13621.

Almost surely, 2^55261840 is an apocalyptic number.

It is an amenable number.

55261840 is an abundant number, since it is smaller than the sum of its proper divisors (77372528).

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

55261840 is a wasteful number, since it uses less digits than its factorization.

55261840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22327 (or 22321 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 55261840 is about 7433.8307755827. The cubic root of 55261840 is about 380.8977848942.

The spelling of 55261840 in words is "fifty-five million, two hundred sixty-one thousand, eight hundred forty".