28415720091 has 16 divisors (see below), whose sum is σ = 41339541888. Its totient is φ = 17218488000.

The previous prime is 28415720089. The next prime is 28415720101. The reversal of 28415720091 is 19002751482.

It is not a de Polignac number, because 28415720091 - 2¹ = 28415720089 is a prime.

It is a super-2 number, since 2×28415720091² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28415727091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110295 + ... + 262671.

It is an arithmetic number, because the mean of its divisors is an integer number (2583721368).

Almost surely, 2^28415720091 is an apocalyptic number.

28415720091 is a deficient number, since it is larger than the sum of its proper divisors (12923821797).

28415720091 is a wasteful number, since it uses less digits than its factorization.

28415720091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158042.

The product of its (nonzero) digits is 40320, while the sum is 39.

The spelling of 28415720091 in words is "twenty-eight billion, four hundred fifteen million, seven hundred twenty thousand, ninety-one".