97868781 has 12 divisors (see below), whose sum is σ = 141467040. Its totient is φ = 65199240.

The previous prime is 97868773. The next prime is 97868789. The reversal of 97868781 is 18786879.

It is an interprime number because it is at equal distance from previous prime (97868773) and next prime (97868789).

It is not a de Polignac number, because 97868781 - 2³ = 97868773 is a prime.

It is a super-2 number, since 2×97868781² = 19156596588851922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97868789) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13510 + ... + 19448.

It is an arithmetic number, because the mean of its divisors is an integer number (11788920).

Almost surely, 2^97868781 is an apocalyptic number.

It is an amenable number.

97868781 is a deficient number, since it is larger than the sum of its proper divisors (43598259).

97868781 is a wasteful number, since it uses less digits than its factorization.

97868781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7776 (or 7773 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 54.

The square root of 97868781 is about 9892.8651562629. The cubic root of 97868781 is about 460.8377628603.

It can be divided in two parts, 9786878 and 1, that added together give a palindrome (9786879).

The spelling of 97868781 in words is "ninety-seven million, eight hundred sixty-eight thousand, seven hundred eighty-one".