28978190440 has 16 divisors (see below), whose sum is σ = 65200928580. Its totient is φ = 11591276160.

The previous prime is 28978190341. The next prime is 28978190459. The reversal of 28978190440 is 4409187982.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 26837647684 + 2140542756 = 163822^2 + 46266^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 362227341 + ... + 362227420.

Almost surely, 2^28978190440 is an apocalyptic number.

28978190440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28978190440 is an abundant number, since it is smaller than the sum of its proper divisors (36222738140).

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

28978190440 is a wasteful number, since it uses less digits than its factorization.

28978190440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724454772 (or 724454768 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 52.

The spelling of 28978190440 in words is "twenty-eight billion, nine hundred seventy-eight million, one hundred ninety thousand, four hundred forty".