51069564 has 216 divisors, whose sum is σ = 172540368. Its totient is φ = 12579840.

The previous prime is 51069553. The next prime is 51069593. The reversal of 51069564 is 46596015.

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 71 ways as a sum of consecutive naturals, for example, 389779 + ... + 389909.

It is an arithmetic number, because the mean of its divisors is an integer number (798798).

Almost surely, 2^51069564 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51069564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86270184).

51069564 is an abundant number, since it is smaller than the sum of its proper divisors (121470804).

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

51069564 is a wasteful number, since it uses less digits than its factorization.

51069564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185 (or 173 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 51069564 is about 7146.2972230380. The cubic root of 51069564 is about 371.0115102635.

The spelling of 51069564 in words is "fifty-one million, sixty-nine thousand, five hundred sixty-four".