28742078 has 8 divisors (see below), whose sum is σ = 43720560. Its totient is φ = 14168560.

The previous prime is 28742069. The next prime is 28742083. The reversal of 28742078 is 87024782.

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

It is a super-2 number, since 2×28742078² = 1652214095516168, which contains 22 as substring.

It is a congruent number.

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, 101063 + ... + 101346.

It is an arithmetic number, because the mean of its divisors is an integer number (5465070).

Almost surely, 2^28742078 is an apocalyptic number.

28742078 is a deficient number, since it is larger than the sum of its proper divisors (14978482).

28742078 is a wasteful number, since it uses less digits than its factorization.

28742078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202482.

The product of its (nonzero) digits is 50176, while the sum is 38.

The square root of 28742078 is about 5361.1638661768. The cubic root of 28742078 is about 306.3181434924.

The spelling of 28742078 in words is "twenty-eight million, seven hundred forty-two thousand, seventy-eight".