91290638900628 has 36 divisors (see below), whose sum is σ = 230800673570740. Its totient is φ = 30425172276096.

The previous prime is 91290638900623. The next prime is 91290638900711. The reversal of 91290638900628 is 82600983609219.

It can be written as a sum of positive squares in 2 ways, for example, as 6404857531524 + 84885781369104 = 2530782^2 + 9213348^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91290638900623) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 209808433 + ... + 210243096.

Almost surely, 2^{91290638900628} is an apocalyptic number.

It is an amenable number.

91290638900628 is an abundant number, since it is smaller than the sum of its proper divisors (139510034670112).

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

91290638900628 is a wasteful number, since it uses less digits than its factorization.

91290638900628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420057576 (or 420057571 counting only the distinct ones).

The product of its (nonzero) digits is 20155392, while the sum is 63.

The spelling of 91290638900628 in words is "ninety-one trillion, two hundred ninety billion, six hundred thirty-eight million, nine hundred thousand, six hundred twenty-eight".