28531029780 has 72 divisors (see below), whose sum is σ = 94411777824. Its totient is φ = 6916612800.

The previous prime is 28531029763. The next prime is 28531029797. The reversal of 28531029780 is 8792013582.

It is a happy number.

28531029780 is a `hidden beast` number, since 28 + 531 + 0 + 2 + 97 + 8 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (28531029763) and next prime (28531029797).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 7202826 + ... + 7206785.

It is an arithmetic number, because the mean of its divisors is an integer number (1311274692).

Almost surely, 2^28531029780 is an apocalyptic number.

28531029780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28531029780 is an abundant number, since it is smaller than the sum of its proper divisors (65880748044).

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

28531029780 is a wasteful number, since it uses less digits than its factorization.

28531029780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14409637 (or 14409632 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The spelling of 28531029780 in words is "twenty-eight billion, five hundred thirty-one million, twenty-nine thousand, seven hundred eighty".