55770820 has 36 divisors (see below), whose sum is σ = 136242540. Its totient is φ = 19121088.

The previous prime is 55770817. The next prime is 55770821. The reversal of 55770820 is 2807755.

It can be written as a sum of positive squares in 2 ways, for example, as 16257024 + 39513796 = 4032^2 + 6286^2 .

It is a super-2 number, since 2×55770820² = 6220768726944800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55770821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27475 + ... + 29434.

It is an arithmetic number, because the mean of its divisors is an integer number (3784515).

Almost surely, 2^55770820 is an apocalyptic number.

It is an amenable number.

55770820 is an abundant number, since it is smaller than the sum of its proper divisors (80471720).

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

55770820 is a wasteful number, since it uses less digits than its factorization.

55770820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56932 (or 56923 counting only the distinct ones).

The product of its (nonzero) digits is 19600, while the sum is 34.

The square root of 55770820 is about 7467.9863417122. The cubic root of 55770820 is about 382.0636115661.

The spelling of 55770820 in words is "fifty-five million, seven hundred seventy thousand, eight hundred twenty".