728774986 has 8 divisors (see below), whose sum is σ = 1097518464. Its totient is φ = 362935500.

The previous prime is 728774983. The next prime is 728774993. The reversal of 728774986 is 689477827.

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

It is a super-2 number, since 2×728774986² = 1062225960438600392, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 728774986.

It is not an unprimeable number, because it can be changed into a prime (728774983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 725370 + ... + 726373.

It is an arithmetic number, because the mean of its divisors is an integer number (137189808).

Almost surely, 2^728774986 is an apocalyptic number.

728774986 is a deficient number, since it is larger than the sum of its proper divisors (368743478).

728774986 is a wasteful number, since it uses less digits than its factorization.

728774986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1451996.

The product of its digits is 9483264, while the sum is 58.

The square root of 728774986 is about 26995.8327524824. The cubic root of 728774986 is about 899.9073921173.

The spelling of 728774986 in words is "seven hundred twenty-eight million, seven hundred seventy-four thousand, nine hundred eighty-six".