2800978 has 4 divisors (see below), whose sum is σ = 4201470. Its totient is φ = 1400488.

The previous prime is 2800969. The next prime is 2800979. The reversal of 2800978 is 8790082.

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 only one way, i.e., 1885129 + 915849 = 1373^2 + 957^2 .

It is not an unprimeable number, because it can be changed into a prime (2800979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 700243 + ... + 700246.

2^2800978 is an apocalyptic number.

2800978 is a deficient number, since it is larger than the sum of its proper divisors (1400492).

2800978 is a wasteful number, since it uses less digits than its factorization.

2800978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1400491.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 2800978 is about 1673.6122609494. The cubic root of 2800978 is about 140.9623828695.

The spelling of 2800978 in words is "two million, eight hundred thousand, nine hundred seventy-eight".