28978038 has 24 divisors (see below), whose sum is σ = 64123488. Its totient is φ = 9453552.

The previous prime is 28978003. The next prime is 28978073. The reversal of 28978038 is 83087982.

It is an interprime number because it is at equal distance from previous prime (28978003) and next prime (28978073).

It is a junction number, because it is equal to n+sod(n) for n = 28977984 and 28978002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16281 + ... + 17972.

It is an arithmetic number, because the mean of its divisors is an integer number (2671812).

Almost surely, 2^28978038 is an apocalyptic number.

28978038 is an abundant number, since it is smaller than the sum of its proper divisors (35145450).

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

28978038 is a wasteful number, since it uses less digits than its factorization.

28978038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34308 (or 34305 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 28978038 is about 5383.1253004180. The cubic root of 28978038 is about 307.1541064051.

The spelling of 28978038 in words is "twenty-eight million, nine hundred seventy-eight thousand, thirty-eight".