91216427400 has 1536 divisors, whose sum is σ = 414830592000. Its totient is φ = 17915904000.

The previous prime is 91216427399. The next prime is 91216427411. The reversal of 91216427400 is 472461219.

It is a happy number.

91216427400 is a `hidden beast` number, since 9 + 1 + 2 + 1 + 642 + 7 + 4 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 378491280 + ... + 378491520.

It is an arithmetic number, because the mean of its divisors is an integer number (270072000).

Almost surely, 2^91216427400 is an apocalyptic number.

91216427400 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 91216427400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (207415296000).

91216427400 is an abundant number, since it is smaller than the sum of its proper divisors (323614164600).

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

91216427400 is a wasteful number, since it uses less digits than its factorization.

91216427400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340 (or 325 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

Adding to 91216427400 its reverse (472461219), we get a palindrome (91688888619).

The spelling of 91216427400 in words is "ninety-one billion, two hundred sixteen million, four hundred twenty-seven thousand, four hundred".