97891878 has 64 divisors (see below), whose sum is σ = 233280000. Its totient is φ = 26793984.

The previous prime is 97891867. The next prime is 97891903. The reversal of 97891878 is 87819879.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 217798 + ... + 218246.

It is an arithmetic number, because the mean of its divisors is an integer number (3645000).

Almost surely, 2^97891878 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 97891878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116640000).

97891878 is an abundant number, since it is smaller than the sum of its proper divisors (135388122).

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

97891878 is a wasteful number, since it uses less digits than its factorization.

97891878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669.

The product of its digits is 2032128, while the sum is 57.

The square root of 97891878 is about 9894.0324438522. The cubic root of 97891878 is about 460.8740125287.

The spelling of 97891878 in words is "ninety-seven million, eight hundred ninety-one thousand, eight hundred seventy-eight".