505747664 has 10 divisors (see below), whose sum is σ = 979886130. Its totient is φ = 252873824.

The previous prime is 505747657. The next prime is 505747673. The reversal of 505747664 is 466747505.

It can be written as a sum of positive squares in only one way, i.e., 356907664 + 148840000 = 18892^2 + 12200^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15804599 + ... + 15804630.

It is an arithmetic number, because the mean of its divisors is an integer number (97988613).

Almost surely, 2^505747664 is an apocalyptic number.

It is an amenable number.

505747664 is a deficient number, since it is larger than the sum of its proper divisors (474138466).

505747664 is a wasteful number, since it uses less digits than its factorization.

505747664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31609237 (or 31609231 counting only the distinct ones).

The product of its (nonzero) digits is 705600, while the sum is 44.

The square root of 505747664 is about 22488.8342072238. The cubic root of 505747664 is about 796.7302289542.

The spelling of 505747664 in words is "five hundred five million, seven hundred forty-seven thousand, six hundred sixty-four".