55691000 has 32 divisors (see below), whose sum is σ = 130319280. Its totient is φ = 22276000.

The previous prime is 55690979. The next prime is 55691011. The reversal of 55691000 is 19655.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26846 + ... + 28845.

Almost surely, 2^55691000 is an apocalyptic number.

55691000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

55691000 is an abundant number, since it is smaller than the sum of its proper divisors (74628280).

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

55691000 is a wasteful number, since it uses less digits than its factorization.

55691000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55712 (or 55698 counting only the distinct ones).

The product of its (nonzero) digits is 1350, while the sum is 26.

The square root of 55691000 is about 7462.6402834386. The cubic root of 55691000 is about 381.8812528944.

The spelling of 55691000 in words is "fifty-five million, six hundred ninety-one thousand".