55722040 has 32 divisors (see below), whose sum is σ = 136773360. Its totient is φ = 20262400.

The previous prime is 55721959. The next prime is 55722047. The reversal of 55722040 is 4022755.

It is a junction number, because it is equal to n+sod(n) for n = 55721996 and 55722014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55722047) 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, 62881 + ... + 63760.

Almost surely, 2^55722040 is an apocalyptic number.

It is an amenable number.

55722040 is an abundant number, since it is smaller than the sum of its proper divisors (81051320).

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

55722040 is a wasteful number, since it uses less digits than its factorization.

55722040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126663 (or 126659 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 25.

The square root of 55722040 is about 7464.7196866326. The cubic root of 55722040 is about 381.9521883090.

Adding to 55722040 its reverse (4022755), we get a palindrome (59744795).

The spelling of 55722040 in words is "fifty-five million, seven hundred twenty-two thousand, forty".