728420390 has 8 divisors (see below), whose sum is σ = 1311156720. Its totient is φ = 291368152.

The previous prime is 728420377. The next prime is 728420401. The reversal of 728420390 is 93024827.

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

It is a self number, because there is not a number n which added to its sum of digits gives 728420390.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36421010 + ... + 36421029.

It is an arithmetic number, because the mean of its divisors is an integer number (163894590).

Almost surely, 2^728420390 is an apocalyptic number.

728420390 is a deficient number, since it is larger than the sum of its proper divisors (582736330).

728420390 is a wasteful number, since it uses less digits than its factorization.

728420390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72842046.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 728420390 is about 26989.2643471437. The cubic root of 728420390 is about 899.7614141238.

The spelling of 728420390 in words is "seven hundred twenty-eight million, four hundred twenty thousand, three hundred ninety".