2563978 has 8 divisors (see below), whose sum is σ = 3857760. Its totient is φ = 1278060.

The previous prime is 2563969. The next prime is 2563997. The reversal of 2563978 is 8793652.

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

It is a d-powerful number, because it can be written as 2²¹ + 5⁵ + 6⁷ + 3¹¹ + 9⁴ + 7² + 8 .

It is a self number, because there is not a number n which added to its sum of digits gives 2563978.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1068 + ... + 2503.

It is an arithmetic number, because the mean of its divisors is an integer number (482220).

2^2563978 is an apocalyptic number.

2563978 is a deficient number, since it is larger than the sum of its proper divisors (1293782).

2563978 is a wasteful number, since it uses less digits than its factorization.

2563978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3932.

The product of its digits is 90720, while the sum is 40.

The square root of 2563978 is about 1601.2426424499. The cubic root of 2563978 is about 136.8688961923.

The spelling of 2563978 in words is "two million, five hundred sixty-three thousand, nine hundred seventy-eight".