55720032 has 24 divisors (see below), whose sum is σ = 146265336. Its totient is φ = 18573312.

The previous prime is 55720003. The next prime is 55720061. The reversal of 55720032 is 23002755.

It is an interprime number because it is at equal distance from previous prime (55720003) and next prime (55720061).

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 55719984 and 55720011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 290113 + ... + 290304.

It is an arithmetic number, because the mean of its divisors is an integer number (6094389).

Almost surely, 2^55720032 is an apocalyptic number.

It is an amenable number.

55720032 is an abundant number, since it is smaller than the sum of its proper divisors (90545304).

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

55720032 is a wasteful number, since it uses less digits than its factorization.

55720032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580430 (or 580422 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 24.

The square root of 55720032 is about 7464.5851860636. The cubic root of 55720032 is about 381.9476002429.

Adding to 55720032 its reverse (23002755), we get a palindrome (78722787).

The spelling of 55720032 in words is "fifty-five million, seven hundred twenty thousand, thirty-two".