91470540 has 192 divisors, whose sum is σ = 323979264. Its totient is φ = 18788352.

The previous prime is 91470539. The next prime is 91470569. The reversal of 91470540 is 4507419.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 91470498 and 91470507.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 163942 + ... + 164498.

It is an arithmetic number, because the mean of its divisors is an integer number (1687392).

Almost surely, 2^91470540 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 91470540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (161989632).

91470540 is an abundant number, since it is smaller than the sum of its proper divisors (232508724).

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

91470540 is a wasteful number, since it uses less digits than its factorization.

91470540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616 (or 614 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 91470540 is about 9564.0232120170. The cubic root of 91470540 is about 450.5680726959.

Adding to 91470540 its reverse (4507419), we get a palindrome (95977959).

The spelling of 91470540 in words is "ninety-one million, four hundred seventy thousand, five hundred forty".