728661902 has 4 divisors (see below), whose sum is σ = 1092992856. Its totient is φ = 364330950.

The previous prime is 728661893. The next prime is 728661907. The reversal of 728661902 is 209166827.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 728661902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728661907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 182165474 + ... + 182165477.

It is an arithmetic number, because the mean of its divisors is an integer number (273248214).

Almost surely, 2^728661902 is an apocalyptic number.

728661902 is a deficient number, since it is larger than the sum of its proper divisors (364330954).

728661902 is a wasteful number, since it uses less digits than its factorization.

728661902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364330953.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 728661902 is about 26993.7381998122. The cubic root of 728661902 is about 899.8608435055.

The spelling of 728661902 in words is "seven hundred twenty-eight million, six hundred sixty-one thousand, nine hundred two".