28078540220 has 24 divisors (see below), whose sum is σ = 59002629504. Its totient is φ = 11224236096.

The previous prime is 28078540213. The next prime is 28078540223. The reversal of 28078540220 is 2204587082.

It is a happy number.

It is a super-3 number, since 3×28078540220³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28078540223) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 416627 + ... + 479306.

It is an arithmetic number, because the mean of its divisors is an integer number (2458442896).

Almost surely, 2^28078540220 is an apocalyptic number.

28078540220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28078540220 is an abundant number, since it is smaller than the sum of its proper divisors (30924089284).

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

28078540220 is a wasteful number, since it uses less digits than its factorization.

28078540220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 897509 (or 897507 counting only the distinct ones).

The product of its (nonzero) digits is 71680, while the sum is 38.

The spelling of 28078540220 in words is "twenty-eight billion, seventy-eight million, five hundred forty thousand, two hundred twenty".