55551840 has 48 divisors (see below), whose sum is σ = 174989808. Its totient is φ = 14813696.

The previous prime is 55551827. The next prime is 55551841. The reversal of 55551840 is 4815555.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55551841) 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, 57387 + ... + 58346.

It is an arithmetic number, because the mean of its divisors is an integer number (3645621).

Almost surely, 2^55551840 is an apocalyptic number.

It is an amenable number.

55551840 is an abundant number, since it is smaller than the sum of its proper divisors (119437968).

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

55551840 is a wasteful number, since it uses less digits than its factorization.

55551840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115751 (or 115743 counting only the distinct ones).

The product of its (nonzero) digits is 20000, while the sum is 33.

The square root of 55551840 is about 7453.3106737879. The cubic root of 55551840 is about 381.5629074961.

The spelling of 55551840 in words is "fifty-five million, five hundred fifty-one thousand, eight hundred forty".