28820378 has 8 divisors (see below), whose sum is σ = 45505920. Its totient is φ = 13651740.

The previous prime is 28820369. The next prime is 28820381. The reversal of 28820378 is 87302882.

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

It is a super-2 number, since 2×28820378² = 1661228376125768, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (38), and also a Moran number because the ratio is a prime number: 758431 = 28820378 / (2 + 8 + 8 + 2 + 0 + 3 + 7 + 8).

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, 379178 + ... + 379253.

It is an arithmetic number, because the mean of its divisors is an integer number (5688240).

Almost surely, 2^28820378 is an apocalyptic number.

28820378 is a deficient number, since it is larger than the sum of its proper divisors (16685542).

28820378 is a wasteful number, since it uses less digits than its factorization.

28820378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 758452.

The product of its (nonzero) digits is 43008, while the sum is 38.

The square root of 28820378 is about 5368.4614183209. The cubic root of 28820378 is about 306.5960515313.

The spelling of 28820378 in words is "twenty-eight million, eight hundred twenty thousand, three hundred seventy-eight".