28363167720 has 48 divisors (see below), whose sum is σ = 92180296260. Its totient is φ = 7563511296.

The previous prime is 28363167709. The next prime is 28363167731. The reversal of 28363167720 is 2776136382.

28363167720 is a `hidden beast` number, since 2 + 8 + 3 + 631 + 6 + 7 + 7 + 2 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (28363167709) and next prime (28363167731).

It can be written as a sum of positive squares in 2 ways, for example, as 27896348484 + 466819236 = 167022^2 + 21606^2 .

It is a super-2 number, since 2×28363167720² (a number of 22 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39392929 + ... + 39393648.

Almost surely, 2^28363167720 is an apocalyptic number.

28363167720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28363167720 is an abundant number, since it is smaller than the sum of its proper divisors (63817128540).

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

28363167720 is a wasteful number, since it uses less digits than its factorization.

28363167720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78786594 (or 78786587 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 45.

The spelling of 28363167720 in words is "twenty-eight billion, three hundred sixty-three million, one hundred sixty-seven thousand, seven hundred twenty".