97720285678 has 4 divisors (see below), whose sum is σ = 146580428520. Its totient is φ = 48860142838.

The previous prime is 97720285673. The next prime is 97720285687. The reversal of 97720285678 is 87658202779.

It is a semiprime because it is the product of two primes.

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 pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24430071418 + ... + 24430071421.

It is an arithmetic number, because the mean of its divisors is an integer number (36645107130).

Almost surely, 2^97720285678 is an apocalyptic number.

97720285678 is a deficient number, since it is larger than the sum of its proper divisors (48860142842).

97720285678 is a wasteful number, since it uses less digits than its factorization.

97720285678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48860142841.

The product of its (nonzero) digits is 23708160, while the sum is 61.

The spelling of 97720285678 in words is "ninety-seven billion, seven hundred twenty million, two hundred eighty-five thousand, six hundred seventy-eight".