28155497615 has 32 divisors (see below), whose sum is σ = 39702234624. Its totient is φ = 18763332480.

The previous prime is 28155497609. The next prime is 28155497647. The reversal of 28155497615 is 51679455182.

It is a Cunningham number, because it is equal to 167796²-1.

It is not a de Polignac number, because 28155497615 - 2¹² = 28155493519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1162580 + ... + 1186550.

It is an arithmetic number, because the mean of its divisors is an integer number (1240694832).

Almost surely, 2^28155497615 is an apocalyptic number.

28155497615 is a deficient number, since it is larger than the sum of its proper divisors (11546737009).

28155497615 is a wasteful number, since it uses less digits than its factorization.

28155497615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24927.

The product of its digits is 3024000, while the sum is 53.

The spelling of 28155497615 in words is "twenty-eight billion, one hundred fifty-five million, four hundred ninety-seven thousand, six hundred fifteen".