55011690 has 64 divisors (see below), whose sum is σ = 148936320. Its totient is φ = 14446080.

The previous prime is 55011683. The next prime is 55011731. The reversal of 55011690 is 9611055.

It is a super-2 number, since 2×55011690² = 6052572073312200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16570 + ... + 19610.

It is an arithmetic number, because the mean of its divisors is an integer number (2327130).

Almost surely, 2^55011690 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55011690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74468160).

55011690 is an abundant number, since it is smaller than the sum of its proper divisors (93924630).

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

55011690 is a wasteful number, since it uses less digits than its factorization.

55011690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3124 (or 3118 counting only the distinct ones).

The product of its (nonzero) digits is 1350, while the sum is 27.

The square root of 55011690 is about 7416.9865848605. The cubic root of 55011690 is about 380.3221875094.

The spelling of 55011690 in words is "fifty-five million, eleven thousand, six hundred ninety".