28191612501 has 192 divisors, whose sum is σ = 50193561600. Its totient is φ = 15080712192.

The previous prime is 28191612481. The next prime is 28191612503. The reversal of 28191612501 is 10521619182.

28191612501 is a `hidden beast` number, since 2 + 8 + 1 + 91 + 61 + 2 + 501 = 666.

It is not a de Polignac number, because 28191612501 - 2¹⁵ = 28191579733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28191612503) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 126419676 + ... + 126419898.

It is an arithmetic number, because the mean of its divisors is an integer number (261424800).

Almost surely, 2^28191612501 is an apocalyptic number.

It is an amenable number.

28191612501 is a deficient number, since it is larger than the sum of its proper divisors (22001949099).

28191612501 is a wasteful number, since it uses less digits than its factorization.

28191612501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380 (or 377 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 36.

The spelling of 28191612501 in words is "twenty-eight billion, one hundred ninety-one million, six hundred twelve thousand, five hundred one".