28215371562 has 24 divisors (see below), whose sum is σ = 64494766176. Its totient is φ = 8061223704.

The previous prime is 28215371539. The next prime is 28215371567. The reversal of 28215371562 is 26517351282.

It is a super-2 number, since 2×28215371562² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (28215371567) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1075639 + ... + 1101557.

It is an arithmetic number, because the mean of its divisors is an integer number (2687281924).

Almost surely, 2^28215371562 is an apocalyptic number.

28215371562 is an abundant number, since it is smaller than the sum of its proper divisors (36279394614).

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

28215371562 is an frugal number, since it uses more digits than its factorization.

28215371562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51850 (or 25931 counting only the distinct ones).

The product of its digits is 201600, while the sum is 42.

Multiplying 28215371562 by its sum of digits (42), we get a square (1185045605604 = 1088598²).

28215371562 divided by its sum of digits (42) gives a square (671794561 = 25919²).

The spelling of 28215371562 in words is "twenty-eight billion, two hundred fifteen million, three hundred seventy-one thousand, five hundred sixty-two".