55623240 has 64 divisors (see below), whose sum is σ = 185414400. Its totient is φ = 14832576.

The previous prime is 55623229. The next prime is 55623251. The reversal of 55623240 is 4232655.

It is an interprime number because it is at equal distance from previous prime (55623229) and next prime (55623251).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24672 + ... + 26831.

It is an arithmetic number, because the mean of its divisors is an integer number (2897100).

Almost surely, 2^55623240 is an apocalyptic number.

It is an amenable number.

55623240 is an abundant number, since it is smaller than the sum of its proper divisors (129791160).

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

55623240 is a wasteful number, since it uses less digits than its factorization.

55623240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51523 (or 51513 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 55623240 is about 7458.0989534867. The cubic root of 55623240 is about 381.7263099924.

Adding to 55623240 its reverse (4232655), we get a palindrome (59855895).

The spelling of 55623240 in words is "fifty-five million, six hundred twenty-three thousand, two hundred forty".