100728290 has 16 divisors (see below), whose sum is σ = 195258168. Its totient is φ = 37191936.

The previous prime is 100728283. The next prime is 100728301. The reversal of 100728290 is 92827001.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 45657049 + 55071241 = 6757^2 + 7421^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 387287 + ... + 387546.

Almost surely, 2^100728290 is an apocalyptic number.

100728290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

100728290 is a deficient number, since it is larger than the sum of its proper divisors (94529878).

100728290 is a wasteful number, since it uses less digits than its factorization.

100728290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 774853.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 100728290 is about 10036.3484395471. The cubic root of 100728290 is about 465.2829664773.

The spelling of 100728290 in words is "one hundred million, seven hundred twenty-eight thousand, two hundred ninety".