28491691103532 has 72 divisors (see below), whose sum is σ = 73699699993920. Its totient is φ = 9275843777760.

The previous prime is 28491691103507. The next prime is 28491691103599. The reversal of 28491691103532 is 23530119619482.

28491691103532 is a `hidden beast` number, since 2 + 8 + 4 + 9 + 1 + 6 + 91 + 10 + 3 + 532 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27559219 + ... + 28574357.

It is an arithmetic number, because the mean of its divisors is an integer number (1023606944360).

Almost surely, 2^{28491691103532} is an apocalyptic number.

It is an amenable number.

28491691103532 is an abundant number, since it is smaller than the sum of its proper divisors (45208008890388).

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

28491691103532 is a wasteful number, since it uses less digits than its factorization.

28491691103532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1033323 (or 1033318 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 54.

The spelling of 28491691103532 in words is "twenty-eight trillion, four hundred ninety-one billion, six hundred ninety-one million, one hundred three thousand, five hundred thirty-two".