51867765 has 24 divisors (see below), whose sum is σ = 95194008. Its totient is φ = 26035200.

The previous prime is 51867757. The next prime is 51867787. The reversal of 51867765 is 56776815.

51867765 is a `hidden beast` number, since 518 + 6 + 77 + 65 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 10381284 + 41486481 = 3222^2 + 6441^2 .

It is not a de Polignac number, because 51867765 - 2³ = 51867757 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 51867765.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33136 + ... + 34665.

It is an arithmetic number, because the mean of its divisors is an integer number (3966417).

Almost surely, 2^51867765 is an apocalyptic number.

It is an amenable number.

51867765 is a deficient number, since it is larger than the sum of its proper divisors (43326243).

51867765 is a wasteful number, since it uses less digits than its factorization.

51867765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67829 (or 67826 counting only the distinct ones).

The product of its digits is 352800, while the sum is 45.

The square root of 51867765 is about 7201.9278668979. The cubic root of 51867765 is about 372.9344569744.

The spelling of 51867765 in words is "fifty-one million, eight hundred sixty-seven thousand, seven hundred sixty-five".