28077838 has 4 divisors (see below), whose sum is σ = 42116760. Its totient is φ = 14038918.

The previous prime is 28077823. The next prime is 28077851. The reversal of 28077838 is 83877082.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 28077794 and 28077803.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7019458 + ... + 7019461.

It is an arithmetic number, because the mean of its divisors is an integer number (10529190).

Almost surely, 2^28077838 is an apocalyptic number.

28077838 is a deficient number, since it is larger than the sum of its proper divisors (14038922).

28077838 is a wasteful number, since it uses less digits than its factorization.

28077838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14038921.

The product of its (nonzero) digits is 150528, while the sum is 43.

The square root of 28077838 is about 5298.8525172909. The cubic root of 28077838 is about 303.9400201957.

The spelling of 28077838 in words is "twenty-eight million, seventy-seven thousand, eight hundred thirty-eight".