91723632 has 320 divisors, whose sum is σ = 335978496. Its totient is φ = 20782080.

The previous prime is 91723631. The next prime is 91723651. The reversal of 91723632 is 23632719.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 91723593 and 91723602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91723631) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1105063 + ... + 1105145.

Almost surely, 2^91723632 is an apocalyptic number.

91723632 is a gapful number since it is divisible by the number (92) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91723632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (167989248).

91723632 is an abundant number, since it is smaller than the sum of its proper divisors (244254864).

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

91723632 is a wasteful number, since it uses less digits than its factorization.

91723632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148 (or 142 counting only the distinct ones).

The product of its digits is 13608, while the sum is 33.

The square root of 91723632 is about 9577.2455330330. The cubic root of 91723632 is about 450.9832524922.

The spelling of 91723632 in words is "ninety-one million, seven hundred twenty-three thousand, six hundred thirty-two".