97720285679 has 4 divisors (see below), whose sum is σ = 101968993776. Its totient is φ = 93471577584.

The previous prime is 97720285673. The next prime is 97720285687. The reversal of 97720285679 is 97658202779.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97658202779 = 113 ⋅864231883.

It is a cyclic number.

It is not a de Polignac number, because 97720285679 - 2¹² = 97720281583 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97720285673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2124354014 + ... + 2124354059.

It is an arithmetic number, because the mean of its divisors is an integer number (25492248444).

Almost surely, 2^97720285679 is an apocalyptic number.

97720285679 is a deficient number, since it is larger than the sum of its proper divisors (4248708097).

97720285679 is a wasteful number, since it uses less digits than its factorization.

97720285679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4248708096.

The product of its (nonzero) digits is 26671680, while the sum is 62.

The spelling of 97720285679 in words is "ninety-seven billion, seven hundred twenty million, two hundred eighty-five thousand, six hundred seventy-nine".