28471309780 has 24 divisors (see below), whose sum is σ = 59932464480. Its totient is φ = 11361340320.

The previous prime is 28471309777. The next prime is 28471309781. The reversal of 28471309780 is 8790317482.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28471309781) 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, 1690386 + ... + 1707145.

It is an arithmetic number, because the mean of its divisors is an integer number (2497186020).

Almost surely, 2^28471309780 is an apocalyptic number.

28471309780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28471309780 is an abundant number, since it is smaller than the sum of its proper divisors (31461154700).

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

28471309780 is a wasteful number, since it uses less digits than its factorization.

28471309780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3397959 (or 3397957 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 49.

The spelling of 28471309780 in words is "twenty-eight billion, four hundred seventy-one million, three hundred nine thousand, seven hundred eighty".