2788157 has 4 divisors (see below), whose sum is σ = 2794716. Its totient is φ = 2781600.

The previous prime is 2788133. The next prime is 2788199. The reversal of 2788157 is 7518872.

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 2114116 + 674041 = 1454^2 + 821^2 .

It is a cyclic number.

It is not a de Polignac number, because 2788157 - 2¹⁴ = 2771773 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2788157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2788057) 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, 2594 + ... + 3507.

It is an arithmetic number, because the mean of its divisors is an integer number (698679).

2^2788157 is an apocalyptic number.

It is an amenable number.

2788157 is a deficient number, since it is larger than the sum of its proper divisors (6559).

2788157 is an equidigital number, since it uses as much as digits as its factorization.

2788157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6558.

The product of its digits is 31360, while the sum is 38.

The square root of 2788157 is about 1669.7775300920. Note that the first 3 decimals coincide. The cubic root of 2788157 is about 140.7469767688.

The spelling of 2788157 in words is "two million, seven hundred eighty-eight thousand, one hundred fifty-seven".