28215537952 has 24 divisors (see below), whose sum is σ = 63484960896. Its totient is φ = 12092373312.

The previous prime is 28215537949. The next prime is 28215537971. The reversal of 28215537952 is 25973551282.

It is a happy number.

It is a super-2 number, since 2×28215537952² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 28215537896 and 28215537905.

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, 62980888 + ... + 62981335.

It is an arithmetic number, because the mean of its divisors is an integer number (2645206704).

Almost surely, 2^28215537952 is an apocalyptic number.

It is an amenable number.

28215537952 is an abundant number, since it is smaller than the sum of its proper divisors (35269422944).

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

28215537952 is a wasteful number, since it uses less digits than its factorization.

28215537952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125962240 (or 125962232 counting only the distinct ones).

The product of its digits is 1512000, while the sum is 49.

The spelling of 28215537952 in words is "twenty-eight billion, two hundred fifteen million, five hundred thirty-seven thousand, nine hundred fifty-two".