91802040 has 128 divisors (see below), whose sum is σ = 318193920. Its totient is φ = 20940800.

The previous prime is 91802017. The next prime is 91802047. The reversal of 91802040 is 4020819.

It is a super-2 number, since 2×91802040² = 16855229096323200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 91802040.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91802047) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20395 + ... + 24485.

It is an arithmetic number, because the mean of its divisors is an integer number (2485890).

Almost surely, 2^91802040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91802040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (159096960).

91802040 is an abundant number, since it is smaller than the sum of its proper divisors (226391880).

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

91802040 is a wasteful number, since it uses less digits than its factorization.

91802040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4133 (or 4129 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 91802040 is about 9581.3381111408. The cubic root of 91802040 is about 451.1117203803. Note that the first 3 decimals are identical.

Adding to 91802040 its reverse (4020819), we get a palindrome (95822859).

The spelling of 91802040 in words is "ninety-one million, eight hundred two thousand, forty".