28401312 has 24 divisors (see below), whose sum is σ = 74553696. Its totient is φ = 9467072.

The previous prime is 28401299. The next prime is 28401313. The reversal of 28401312 is 21310482.

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (28401313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 147828 + ... + 148019.

It is an arithmetic number, because the mean of its divisors is an integer number (3106404).

Almost surely, 2^28401312 is an apocalyptic number.

It is an amenable number.

28401312 is an abundant number, since it is smaller than the sum of its proper divisors (46152384).

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

28401312 is a wasteful number, since it uses less digits than its factorization.

28401312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295860 (or 295852 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 28401312 is about 5329.2881325746. The cubic root of 28401312 is about 305.1027585314.

Adding to 28401312 its reverse (21310482), we get a palindrome (49711794).

The spelling of 28401312 in words is "twenty-eight million, four hundred one thousand, three hundred twelve".