91212480 has 392 divisors, whose sum is σ = 359798112. Its totient is φ = 21897216.

The previous prime is 91212479. The next prime is 91212481. The reversal of 91212480 is 8421219.

It is an interprime number because it is at equal distance from previous prime (91212479) and next prime (91212481).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (91212481) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 3965749 + ... + 3965771.

Almost surely, 2^91212480 is an apocalyptic number.

91212480 is a gapful number since it is divisible by the number (90) 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 91212480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (179899056).

91212480 is an abundant number, since it is smaller than the sum of its proper divisors (268585632).

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

91212480 is a wasteful number, since it uses less digits than its factorization.

91212480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75 (or 50 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 91212480 is about 9550.5224987956. The cubic root of 91212480 is about 450.1439539446.

Adding to 91212480 its reverse (8421219), we get a palindrome (99633699).

The spelling of 91212480 in words is "ninety-one million, two hundred twelve thousand, four hundred eighty".