2720978 has 16 divisors (see below), whose sum is σ = 4424280. Its totient is φ = 1247616.

The previous prime is 2720953. The next prime is 2720981. The reversal of 2720978 is 8790272.

It can be written as a sum of positive squares in 4 ways, for example, as 2679769 + 41209 = 1637^2 + 203^2 .

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5726 + ... + 6182.

2^2720978 is an apocalyptic number.

2720978 is a deficient number, since it is larger than the sum of its proper divisors (1703302).

2720978 is a wasteful number, since it uses less digits than its factorization.

2720978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701.

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 2720978 is about 1649.5387234012. The cubic root of 2720978 is about 139.6073692823.

The spelling of 2720978 in words is "two million, seven hundred twenty thousand, nine hundred seventy-eight".