55099680 has 96 divisors (see below), whose sum is σ = 174763008. Its totient is φ = 14592000.

The previous prime is 55099673. The next prime is 55099711. The reversal of 55099680 is 8699055.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×55099680² = 6071949472204800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91380 + ... + 91980.

It is an arithmetic number, because the mean of its divisors is an integer number (1820448).

Almost surely, 2^55099680 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55099680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87381504).

55099680 is an abundant number, since it is smaller than the sum of its proper divisors (119663328).

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

55099680 is a wasteful number, since it uses less digits than its factorization.

55099680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810 (or 802 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 42.

The square root of 55099680 is about 7422.9158691177. The cubic root of 55099680 is about 380.5248518473.

The spelling of 55099680 in words is "fifty-five million, ninety-nine thousand, six hundred eighty".