91857402 has 192 divisors, whose sum is σ = 266133504. Its totient is φ = 23094720.

The previous prime is 91857401. The next prime is 91857473. The reversal of 91857402 is 20475819.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91857401) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1370973 + ... + 1371039.

It is an arithmetic number, because the mean of its divisors is an integer number (1386112).

Almost surely, 2^91857402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91857402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (133066752).

91857402 is an abundant number, since it is smaller than the sum of its proper divisors (174276102).

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

91857402 is a wasteful number, since it uses less digits than its factorization.

91857402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135 (or 123 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 91857402 is about 9584.2267293715. The cubic root of 91857402 is about 451.2023844091.

The spelling of 91857402 in words is "ninety-one million, eight hundred fifty-seven thousand, four hundred two".