51669564 has 24 divisors (see below), whose sum is σ = 121264080. Its totient is φ = 17122944.

The previous prime is 51669559. The next prime is 51669571. The reversal of 51669564 is 46596615.

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, 10369 + ... + 14520.

It is an arithmetic number, because the mean of its divisors is an integer number (5052670).

Almost surely, 2^51669564 is an apocalyptic number.

It is an amenable number.

51669564 is an abundant number, since it is smaller than the sum of its proper divisors (69594516).

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

51669564 is a wasteful number, since it uses less digits than its factorization.

51669564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25069 (or 25067 counting only the distinct ones).

The product of its digits is 194400, while the sum is 42.

The square root of 51669564 is about 7188.1544223813. The cubic root of 51669564 is about 372.4588222278.

The spelling of 51669564 in words is "fifty-one million, six hundred sixty-nine thousand, five hundred sixty-four".