97173978 has 16 divisors (see below), whose sum is σ = 212016096. Its totient is φ = 29446640.

The previous prime is 97173971. The next prime is 97173997. The reversal of 97173978 is 87937179.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 97173978.

It is not an unprimeable number, because it can be changed into a prime (97173971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 736101 + ... + 736232.

It is an arithmetic number, because the mean of its divisors is an integer number (13251006).

Almost surely, 2^97173978 is an apocalyptic number.

97173978 is an abundant number, since it is smaller than the sum of its proper divisors (114842118).

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

97173978 is a wasteful number, since it uses less digits than its factorization.

97173978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1472349.

The product of its digits is 666792, while the sum is 51.

The square root of 97173978 is about 9857.6862396812. The cubic root of 97173978 is about 459.7446251073.

It can be divided in two parts, 9717 and 3978, that added together give a triangular number (13695 = T₁₆₅).

The spelling of 97173978 in words is "ninety-seven million, one hundred seventy-three thousand, nine hundred seventy-eight".