2188678057 has 4 divisors (see below), whose sum is σ = 2247831556. Its totient is φ = 2129524560.

The previous prime is 2188678033. The next prime is 2188678061. The reversal of 2188678057 is 7508768812.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1848054121 + 340623936 = 42989^2 + 18456^2 .

It is a cyclic number.

It is not a de Polignac number, because 2188678057 - 2¹⁵ = 2188645289 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2188677995 and 2188678013.

It is not an unprimeable number, because it can be changed into a prime (2188678097) 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, 29576694 + ... + 29576767.

It is an arithmetic number, because the mean of its divisors is an integer number (561957889).

Almost surely, 2^2188678057 is an apocalyptic number.

It is an amenable number.

2188678057 is a deficient number, since it is larger than the sum of its proper divisors (59153499).

2188678057 is an equidigital number, since it uses as much as digits as its factorization.

2188678057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59153498.

The product of its (nonzero) digits is 1505280, while the sum is 52.

The square root of 2188678057 is about 46783.3095986165. The cubic root of 2188678057 is about 1298.3565142726.

The spelling of 2188678057 in words is "two billion, one hundred eighty-eight million, six hundred seventy-eight thousand, fifty-seven".