55420660 has 12 divisors (see below), whose sum is σ = 116383428. Its totient is φ = 22168256.

The previous prime is 55420649. The next prime is 55420667. The reversal of 55420660 is 6602455.

It can be written as a sum of positive squares in 2 ways, for example, as 33686416 + 21734244 = 5804^2 + 4662^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55420667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1385497 + ... + 1385536.

It is an arithmetic number, because the mean of its divisors is an integer number (9698619).

Almost surely, 2^55420660 is an apocalyptic number.

It is an amenable number.

55420660 is an abundant number, since it is smaller than the sum of its proper divisors (60962768).

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

55420660 is a wasteful number, since it uses less digits than its factorization.

55420660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2771042 (or 2771040 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 55420660 is about 7444.5053563014. The cubic root of 55420660 is about 381.2623301575.

The spelling of 55420660 in words is "fifty-five million, four hundred twenty thousand, six hundred sixty".