28208887929616 has 15 divisors (see below), whose sum is σ = 54654761525493. Its totient is φ = 14104433342400.

The previous prime is 28208887929581. The next prime is 28208887929671. The reversal of 28208887929616 is 61692978880282.

The square root of 28208887929616 is 5311204.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 19240540051216 + 8968347878400 = 4386404^2 + 2994720^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 20580916 + ... + 21908716.

Almost surely, 2^{28208887929616} is an apocalyptic number.

28208887929616 is the 5311204-th square number.

It is an amenable number.

28208887929616 is a deficient number, since it is larger than the sum of its proper divisors (26445873595877).

28208887929616 is an frugal number, since it uses more digits than its factorization.

28208887929616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2655610 (or 1327803 counting only the distinct ones).

The product of its (nonzero) digits is 668860416, while the sum is 76.

The spelling of 28208887929616 in words is "twenty-eight trillion, two hundred eight billion, eight hundred eighty-seven million, nine hundred twenty-nine thousand, six hundred sixteen".