728696978 has 16 divisors (see below), whose sum is σ = 1133352000. Its totient is φ = 350971152.

The previous prime is 728696957. The next prime is 728696989. The reversal of 728696978 is 879696827.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 728696978.

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, 11153 + ... + 39771.

It is an arithmetic number, because the mean of its divisors is an integer number (70834500).

Almost surely, 2^728696978 is an apocalyptic number.

728696978 is a deficient number, since it is larger than the sum of its proper divisors (404655022).

728696978 is a wasteful number, since it uses less digits than its factorization.

728696978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29089.

The product of its digits is 18289152, while the sum is 62.

The square root of 728696978 is about 26994.3878982280. The cubic root of 728696978 is about 899.8752823065.

The spelling of 728696978 in words is "seven hundred twenty-eight million, six hundred ninety-six thousand, nine hundred seventy-eight".