55621776 has 40 divisors (see below), whose sum is σ = 164217664. Its totient is φ = 15891840.

The previous prime is 55621757. The next prime is 55621777. The reversal of 55621776 is 67712655.

It is not an unprimeable number, because it can be changed into a prime (55621777) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82435 + ... + 83106.

Almost surely, 2^55621776 is an apocalyptic number.

55621776 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

55621776 is an abundant number, since it is smaller than the sum of its proper divisors (108595888).

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

55621776 is a wasteful number, since it uses less digits than its factorization.

55621776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165559 (or 165553 counting only the distinct ones).

The product of its digits is 88200, while the sum is 39.

The square root of 55621776 is about 7458.0008045052. Note that the first 3 decimals coincide. The cubic root of 55621776 is about 381.7229609592.

The spelling of 55621776 in words is "fifty-five million, six hundred twenty-one thousand, seven hundred seventy-six".