97678989 has 24 divisors (see below), whose sum is σ = 146615040. Its totient is φ = 62590752.

The previous prime is 97678961. The next prime is 97679017. The reversal of 97678989 is 98987679.

It is an interprime number because it is at equal distance from previous prime (97678961) and next prime (97679017).

It is a de Polignac number, because none of the positive numbers 2^k-97678989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97678939) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 67932 + ... + 69354.

It is an arithmetic number, because the mean of its divisors is an integer number (6108960).

Almost surely, 2^97678989 is an apocalyptic number.

It is an amenable number.

97678989 is a deficient number, since it is larger than the sum of its proper divisors (48936051).

97678989 is a wasteful number, since it uses less digits than its factorization.

97678989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1721 (or 1718 counting only the distinct ones).

The product of its digits is 13716864, while the sum is 63.

The square root of 97678989 is about 9883.2681335680. The cubic root of 97678989 is about 460.5396769316.

The spelling of 97678989 in words is "ninety-seven million, six hundred seventy-eight thousand, nine hundred eighty-nine".