55039720 has 32 divisors (see below), whose sum is σ = 127189800. Its totient is φ = 21420288.

The previous prime is 55039711. The next prime is 55039729. The reversal of 55039720 is 2793055.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (55039711) and next prime (55039729).

It can be written as a sum of positive squares in 4 ways, for example, as 55026724 + 12996 = 7418^2 + 114^2 .

It is not an unprimeable number, because it can be changed into a prime (55039729) 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, 17115 + ... + 20074.

Almost surely, 2^55039720 is an apocalyptic number.

It is an amenable number.

55039720 is an abundant number, since it is smaller than the sum of its proper divisors (72150080).

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

55039720 is a wasteful number, since it uses less digits than its factorization.

55039720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37237 (or 37233 counting only the distinct ones).

The product of its (nonzero) digits is 9450, while the sum is 31.

The square root of 55039720 is about 7418.8759256373. The cubic root of 55039720 is about 380.3867714844.

The spelling of 55039720 in words is "fifty-five million, thirty-nine thousand, seven hundred twenty".