28129370 has 8 divisors (see below), whose sum is σ = 50632884. Its totient is φ = 11251744.

The previous prime is 28129301. The next prime is 28129393. The reversal of 28129370 is 7392182.

It can be written as a sum of positive squares in 2 ways, for example, as 27994681 + 134689 = 5291^2 + 367^2 .

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

It is a super-2 number, since 2×28129370² = 1582522913193800, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 1406459 + ... + 1406478.

Almost surely, 2^28129370 is an apocalyptic number.

28129370 is a deficient number, since it is larger than the sum of its proper divisors (22503514).

28129370 is a wasteful number, since it uses less digits than its factorization.

28129370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2812944.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 28129370 is about 5303.7128504473. The cubic root of 28129370 is about 304.1258496135.

The spelling of 28129370 in words is "twenty-eight million, one hundred twenty-nine thousand, three hundred seventy".