55097664 has 56 divisors (see below), whose sum is σ = 150498048. Its totient is φ = 17771520.

The previous prime is 55097657. The next prime is 55097717. The reversal of 55097664 is 46679055.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

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, 1324 + ... + 10580.

Almost surely, 2^55097664 is an apocalyptic number.

55097664 is the 3968-th nonagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55097664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75249024).

55097664 is an abundant number, since it is smaller than the sum of its proper divisors (95400384).

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

55097664 is a wasteful number, since it uses less digits than its factorization.

55097664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9303 (or 9293 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 42.

The square root of 55097664 is about 7422.7800721832. The cubic root of 55097664 is about 380.5202108798.

The spelling of 55097664 in words is "fifty-five million, ninety-seven thousand, six hundred sixty-four".