52778915 has 32 divisors (see below), whose sum is σ = 74732544. Its totient is φ = 35038080.

The previous prime is 52778899. The next prime is 52778917. The reversal of 52778915 is 51987725.

It is not a de Polignac number, because 52778915 - 2⁴ = 52778899 is a prime.

It is a super-2 number, since 2×52778915² = 5571227737154450, which contains 22 as substring.

It is a Smith number, since the sum of its digits (44) 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 not an unprimeable number, because it can be changed into a prime (52778917) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 166337 + ... + 166653.

It is an arithmetic number, because the mean of its divisors is an integer number (2335392).

Almost surely, 2^52778915 is an apocalyptic number.

52778915 is a deficient number, since it is larger than the sum of its proper divisors (21953629).

52778915 is a wasteful number, since it uses less digits than its factorization.

52778915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467.

The product of its digits is 176400, while the sum is 44.

The square root of 52778915 is about 7264.9098411474. The cubic root of 52778915 is about 375.1055465866.

The spelling of 52778915 in words is "fifty-two million, seven hundred seventy-eight thousand, nine hundred fifteen".