28491838 has 4 divisors (see below), whose sum is σ = 42737760. Its totient is φ = 14245918.

The previous prime is 28491829. The next prime is 28491839. The reversal of 28491838 is 83819482.

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 = 28491794 and 28491803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28491839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7122958 + ... + 7122961.

It is an arithmetic number, because the mean of its divisors is an integer number (10684440).

Almost surely, 2^28491838 is an apocalyptic number.

28491838 is a deficient number, since it is larger than the sum of its proper divisors (14245922).

28491838 is a wasteful number, since it uses less digits than its factorization.

28491838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14245921.

The product of its digits is 110592, while the sum is 43.

The square root of 28491838 is about 5337.7746299371. The cubic root of 28491838 is about 305.4265750184.

The spelling of 28491838 in words is "twenty-eight million, four hundred ninety-one thousand, eight hundred thirty-eight".