28394505715 has 8 divisors (see below), whose sum is σ = 34090212240. Its totient is φ = 22704400992.

The previous prime is 28394505709. The next prime is 28394505751. The reversal of 28394505715 is 51750549382.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28394505715 - 2²¹ = 28392408563 is a prime.

It is a super-2 number, since 2×28394505715² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1389289 + ... + 1409578.

It is an arithmetic number, because the mean of its divisors is an integer number (4261276530).

Almost surely, 2^28394505715 is an apocalyptic number.

28394505715 is a deficient number, since it is larger than the sum of its proper divisors (5695706525).

28394505715 is a wasteful number, since it uses less digits than its factorization.

28394505715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2800901.

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

The spelling of 28394505715 in words is "twenty-eight billion, three hundred ninety-four million, five hundred five thousand, seven hundred fifteen".