97720855 has 4 divisors (see below), whose sum is σ = 117265032. Its totient is φ = 78176680.

The previous prime is 97720837. The next prime is 97720873. The reversal of 97720855 is 55802779.

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

It is an interprime number because it is at equal distance from previous prime (97720837) and next prime (97720873).

It is not a de Polignac number, because 97720855 - 2¹⁷ = 97589783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9772081 + ... + 9772090.

It is an arithmetic number, because the mean of its divisors is an integer number (29316258).

Almost surely, 2^97720855 is an apocalyptic number.

97720855 is a deficient number, since it is larger than the sum of its proper divisors (19544177).

97720855 is a wasteful number, since it uses less digits than its factorization.

97720855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19544176.

The product of its (nonzero) digits is 176400, while the sum is 43.

The square root of 97720855 is about 9885.3859307566. The cubic root of 97720855 is about 460.6054645362.

The spelling of 97720855 in words is "ninety-seven million, seven hundred twenty thousand, eight hundred fifty-five".