28729376 has 24 divisors (see below), whose sum is σ = 60912684. Its totient is φ = 13259520.

The previous prime is 28729319. The next prime is 28729403. The reversal of 28729376 is 67392782.

It can be written as a sum of positive squares in 2 ways, for example, as 28344976 + 384400 = 5324^2 + 620^2 .

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, 34115 + ... + 34946.

Almost surely, 2^28729376 is an apocalyptic number.

28729376 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

28729376 is an abundant number, since it is smaller than the sum of its proper divisors (32183308).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28729376 is a wasteful number, since it uses less digits than its factorization.

28729376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69084 (or 69076 counting only the distinct ones).

The product of its digits is 254016, while the sum is 44.

The square root of 28729376 is about 5359.9791044369. The cubic root of 28729376 is about 306.2730130700.

The spelling of 28729376 in words is "twenty-eight million, seven hundred twenty-nine thousand, three hundred seventy-six".