28538748 has 72 divisors (see below), whose sum is σ = 82948320. Its totient is φ = 8104320.

The previous prime is 28538737. The next prime is 28538759. The reversal of 28538748 is 84783582.

It is an interprime number because it is at equal distance from previous prime (28538737) and next prime (28538759).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 67578 + ... + 67998.

It is an arithmetic number, because the mean of its divisors is an integer number (1152060).

Almost surely, 2^28538748 is an apocalyptic number.

28538748 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28538748, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41474160).

28538748 is an abundant number, since it is smaller than the sum of its proper divisors (54409572).

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

28538748 is a wasteful number, since it uses less digits than its factorization.

28538748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707 (or 702 counting only the distinct ones).

The product of its digits is 430080, while the sum is 45.

The square root of 28538748 is about 5342.1669760501. The cubic root of 28538748 is about 305.5941049227.

The spelling of 28538748 in words is "twenty-eight million, five hundred thirty-eight thousand, seven hundred forty-eight".