538220664 has 24 divisors (see below), whose sum is σ = 1457681160. Its totient is φ = 179406864.

The previous prime is 538220651. The next prime is 538220689. The reversal of 538220664 is 466022835.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3737572 + ... + 3737715.

It is an arithmetic number, because the mean of its divisors is an integer number (60736715).

Almost surely, 2^538220664 is an apocalyptic number.

It is an amenable number.

538220664 is an abundant number, since it is smaller than the sum of its proper divisors (919460496).

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

538220664 is a wasteful number, since it uses less digits than its factorization.

538220664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7475299 (or 7475292 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 538220664 is about 23199.5832721194. The cubic root of 538220664 is about 813.4298820856.

The spelling of 538220664 in words is "five hundred thirty-eight million, two hundred twenty thousand, six hundred sixty-four".