55921770 has 24 divisors (see below), whose sum is σ = 145396836. Its totient is φ = 14912448.

The previous prime is 55921753. The next prime is 55921777. The reversal of 55921770 is 7712955.

55921770 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 51796809 + 4124961 = 7197^2 + 2031^2 .

It is not an unprimeable number, because it can be changed into a prime (55921777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 310587 + ... + 310766.

Almost surely, 2^55921770 is an apocalyptic number.

55921770 is an abundant number, since it is smaller than the sum of its proper divisors (89475066).

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

55921770 is a wasteful number, since it uses less digits than its factorization.

55921770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621366 (or 621363 counting only the distinct ones).

The product of its (nonzero) digits is 22050, while the sum is 36.

The square root of 55921770 is about 7478.0859850633. The cubic root of 55921770 is about 382.4080004293.

The spelling of 55921770 in words is "fifty-five million, nine hundred twenty-one thousand, seven hundred seventy".