2878657 has 8 divisors (see below), whose sum is σ = 3021696. Its totient is φ = 2737152.

The previous prime is 2878639. The next prime is 2878679. The reversal of 2878657 is 7568782.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 5-Lehmer number, since φ(2878657) divides (2878657-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 2878657 - 2¹¹ = 2876609 is a prime.

It is a super-2 number, since 2×2878657² = 16573332247298, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2878697) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5668 + ... + 6154.

It is an arithmetic number, because the mean of its divisors is an integer number (377712).

2^2878657 is an apocalyptic number.

It is an amenable number.

2878657 is a deficient number, since it is larger than the sum of its proper divisors (143039).

2878657 is a wasteful number, since it uses less digits than its factorization.

2878657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 767.

The product of its digits is 188160, while the sum is 43.

The square root of 2878657 is about 1696.6605435384. The cubic root of 2878657 is about 142.2536134276.

The spelling of 2878657 in words is "two million, eight hundred seventy-eight thousand, six hundred fifty-seven".