28155497616 has 225 divisors, whose sum is σ = 83957361411. Its totient is φ = 9109309248.

The previous prime is 28155497609. The next prime is 28155497647. The reversal of 28155497616 is 61679455182.

It is a happy number.

The square root of 28155497616 is 167796.

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

28155497616 is a `hidden beast` number, since 2 + 8 + 1 + 554 + 9 + 76 + 16 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 356398665 + ... + 356398743.

Almost surely, 2^28155497616 is an apocalyptic number.

28155497616 is the 167796-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28155497616

28155497616 is an abundant number, since it is smaller than the sum of its proper divisors (55801863795).

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

28155497616 is an frugal number, since it uses more digits than its factorization.

28155497616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296 (or 143 counting only the distinct ones).

The product of its digits is 3628800, while the sum is 54.

The spelling of 28155497616 in words is "twenty-eight billion, one hundred fifty-five million, four hundred ninety-seven thousand, six hundred sixteen".