51764215 has 4 divisors (see below), whose sum is σ = 62117064. Its totient is φ = 41411368.

The previous prime is 51764213. The next prime is 51764243. The reversal of 51764215 is 51246715.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51764215 - 2¹ = 51764213 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51764213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5176417 + ... + 5176426.

It is an arithmetic number, because the mean of its divisors is an integer number (15529266).

Almost surely, 2^51764215 is an apocalyptic number.

51764215 is a deficient number, since it is larger than the sum of its proper divisors (10352849).

51764215 is a wasteful number, since it uses less digits than its factorization.

51764215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10352848.

The product of its digits is 8400, while the sum is 31.

The square root of 51764215 is about 7194.7352279288. The cubic root of 51764215 is about 372.6861133232.

The spelling of 51764215 in words is "fifty-one million, seven hundred sixty-four thousand, two hundred fifteen".