97307891978 has 16 divisors (see below), whose sum is σ = 159237501696. Its totient is φ = 44229080640.

The previous prime is 97307891977. The next prime is 97307892023. The reversal of 97307891978 is 87919870379.

It is not an unprimeable number, because it can be changed into a prime (97307891971) 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, 583175 + ... + 731237.

It is an arithmetic number, because the mean of its divisors is an integer number (9952343856).

Almost surely, 2^97307891978 is an apocalyptic number.

97307891978 is a deficient number, since it is larger than the sum of its proper divisors (61929609718).

97307891978 is a wasteful number, since it uses less digits than its factorization.

97307891978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177949.

The product of its (nonzero) digits is 48009024, while the sum is 68.

The spelling of 97307891978 in words is "ninety-seven billion, three hundred seven million, eight hundred ninety-one thousand, nine hundred seventy-eight".