55780608 has 144 divisors (see below), whose sum is σ = 165286016. Its totient is φ = 16588800.

The previous prime is 55780591. The next prime is 55780609. The reversal of 55780608 is 80608755.

It is a happy number.

It is a super-2 number, since 2×55780608² = 6222952457699328, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55780609) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 369333 + ... + 369483.

Almost surely, 2^55780608 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55780608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82643008).

55780608 is an abundant number, since it is smaller than the sum of its proper divisors (109505408).

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

55780608 is a wasteful number, since it uses less digits than its factorization.

55780608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220 (or 206 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 39.

The square root of 55780608 is about 7468.6416435654. The cubic root of 55780608 is about 382.0859614848.

The spelling of 55780608 in words is "fifty-five million, seven hundred eighty thousand, six hundred eight".