38728728 has 24 divisors (see below), whose sum is σ = 104890500. Its totient is φ = 12909552.

The previous prime is 38728693. The next prime is 38728769. The reversal of 38728728 is 82782783.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 268878 + ... + 269021.

Almost surely, 2^38728728 is an apocalyptic number.

It is an amenable number.

38728728 is an abundant number, since it is smaller than the sum of its proper divisors (66161772).

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

38728728 is a wasteful number, since it uses less digits than its factorization.

38728728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537911 (or 537904 counting only the distinct ones).

The product of its digits is 301056, while the sum is 45.

The square root of 38728728 is about 6223.2409562864. The cubic root of 38728728 is about 338.3330400854. Note that the first 3 decimals are identical.

The spelling of 38728728 in words is "thirty-eight million, seven hundred twenty-eight thousand, seven hundred twenty-eight".