28961968 has 40 divisors (see below), whose sum is σ = 66924288. Its totient is φ = 11871552.

The previous prime is 28961963. The next prime is 28961983. The reversal of 28961968 is 86916982.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (28961963) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3046 + ... + 8197.

Almost surely, 2^28961968 is an apocalyptic number.

28961968 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28961968 is an abundant number, since it is smaller than the sum of its proper divisors (37962320).

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

28961968 is a wasteful number, since it uses less digits than its factorization.

28961968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11281 (or 11275 counting only the distinct ones).

The product of its digits is 373248, while the sum is 49.

The square root of 28961968 is about 5381.6324660831. The cubic root of 28961968 is about 307.0973176604.

It can be divided in two parts, 28961 and 968, that added together give a square (29929 = 173²).

The spelling of 28961968 in words is "twenty-eight million, nine hundred sixty-one thousand, nine hundred sixty-eight".