55070820 has 192 divisors, whose sum is σ = 207567360. Its totient is φ = 11833344.

The previous prime is 55070819. The next prime is 55070863. The reversal of 55070820 is 2807055.

It is a happy number.

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 63 ways as a sum of consecutive naturals, for example, 63832 + ... + 64688.

It is an arithmetic number, because the mean of its divisors is an integer number (1081080).

Almost surely, 2^55070820 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 55070820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103783680).

55070820 is an abundant number, since it is smaller than the sum of its proper divisors (152496540).

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

55070820 is a wasteful number, since it uses less digits than its factorization.

55070820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 899 (or 891 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 27.

The square root of 55070820 is about 7420.9716344964. The cubic root of 55070820 is about 380.4584033963.

Adding to 55070820 its reverse (2807055), we get a palindrome (57877875).

The spelling of 55070820 in words is "fifty-five million, seventy thousand, eight hundred twenty".