55811724 has 24 divisors (see below), whose sum is σ = 130483248. Its totient is φ = 18567360.

The previous prime is 55811719. The next prime is 55811729. The reversal of 55811724 is 42711855.

It is an interprime number because it is at equal distance from previous prime (55811719) and next prime (55811729).

It is a super-2 number, since 2×55811724² = 6229897071704352, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55811729) 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, 2194 + ... + 10790.

It is an arithmetic number, because the mean of its divisors is an integer number (5436802).

Almost surely, 2^55811724 is an apocalyptic number.

It is an amenable number.

55811724 is an abundant number, since it is smaller than the sum of its proper divisors (74671524).

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

55811724 is a wasteful number, since it uses less digits than its factorization.

55811724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9145 (or 9143 counting only the distinct ones).

The product of its digits is 11200, while the sum is 33.

The square root of 55811724 is about 7470.7244628617. The cubic root of 55811724 is about 382.1569943952.

The spelling of 55811724 in words is "fifty-five million, eight hundred eleven thousand, seven hundred twenty-four".