2551678 has 4 divisors (see below), whose sum is σ = 3827520. Its totient is φ = 1275838.

The previous prime is 2551657. The next prime is 2551687. The reversal of 2551678 is 8761552.

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

It is a super-2 number, since 2×2551678² = 13022121231368, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 637918 + ... + 637921.

It is an arithmetic number, because the mean of its divisors is an integer number (956880).

2^2551678 is an apocalyptic number.

2551678 is a deficient number, since it is larger than the sum of its proper divisors (1275842).

2551678 is a wasteful number, since it uses less digits than its factorization.

2551678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1275841.

The product of its digits is 16800, while the sum is 34.

The square root of 2551678 is about 1597.3972580420. The cubic root of 2551678 is about 136.6496812786.

The spelling of 2551678 in words is "two million, five hundred fifty-one thousand, six hundred seventy-eight".