28401912 has 192 divisors, whose sum is σ = 98841600. Its totient is φ = 7153920.

The previous prime is 28401911. The next prime is 28401931. The reversal of 28401912 is 21910482.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28401911) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 260514 + ... + 260622.

It is an arithmetic number, because the mean of its divisors is an integer number (514800).

Almost surely, 2^28401912 is an apocalyptic number.

28401912 is a gapful number since it is divisible by the number (22) 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 28401912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49420800).

28401912 is an abundant number, since it is smaller than the sum of its proper divisors (70439688).

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

28401912 is a wasteful number, since it uses less digits than its factorization.

28401912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186 (or 179 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 28401912 is about 5329.3444249739. The cubic root of 28401912 is about 305.1049070280.

The spelling of 28401912 in words is "twenty-eight million, four hundred one thousand, nine hundred twelve".