38728428 has 12 divisors (see below), whose sum is σ = 90366360. Its totient is φ = 12909472.

The previous prime is 38728411. The next prime is 38728433. The reversal of 38728428 is 82482783.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×38728428² = 2999782270702368, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 38728428.

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, 1613673 + ... + 1613696.

It is an arithmetic number, because the mean of its divisors is an integer number (7530530).

Almost surely, 2^38728428 is an apocalyptic number.

It is an amenable number.

38728428 is an abundant number, since it is smaller than the sum of its proper divisors (51637932).

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

38728428 is a wasteful number, since it uses less digits than its factorization.

38728428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3227376 (or 3227374 counting only the distinct ones).

The product of its digits is 172032, while the sum is 42.

The square root of 38728428 is about 6223.2168530431. The cubic root of 38728428 is about 338.3321664860.

The spelling of 38728428 in words is "thirty-eight million, seven hundred twenty-eight thousand, four hundred twenty-eight".