55691380 has 12 divisors (see below), whose sum is σ = 116951940. Its totient is φ = 22276544.

The previous prime is 55691369. The next prime is 55691453. The reversal of 55691380 is 8319655.

It can be written as a sum of positive squares in 2 ways, for example, as 7333264 + 48358116 = 2708^2 + 6954^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1392265 + ... + 1392304.

It is an arithmetic number, because the mean of its divisors is an integer number (9745995).

Almost surely, 2^55691380 is an apocalyptic number.

It is an amenable number.

55691380 is an abundant number, since it is smaller than the sum of its proper divisors (61260560).

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

55691380 is a wasteful number, since it uses less digits than its factorization.

55691380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2784578 (or 2784576 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 55691380 is about 7462.6657435530. The cubic root of 55691380 is about 381.8821214641.

The spelling of 55691380 in words is "fifty-five million, six hundred ninety-one thousand, three hundred eighty".