7828978 has 16 divisors (see below), whose sum is σ = 12322944. Its totient is φ = 3726000.

The previous prime is 7828963. The next prime is 7828987. The reversal of 7828978 is 8798287.

It is a super-4 number, since 4×7828978⁴ (a number of 29 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is an Ulam 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, 2353 + ... + 4603.

It is an arithmetic number, because the mean of its divisors is an integer number (770184).

Almost surely, 2^7828978 is an apocalyptic number.

7828978 is a deficient number, since it is larger than the sum of its proper divisors (4493966).

7828978 is a wasteful number, since it uses less digits than its factorization.

7828978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2337.

The product of its digits is 451584, while the sum is 49.

The square root of 7828978 is about 2798.0310934655. The cubic root of 7828978 is about 198.5645385677.

The spelling of 7828978 in words is "seven million, eight hundred twenty-eight thousand, nine hundred seventy-eight".