97768221 has 4 divisors (see below), whose sum is σ = 130357632. Its totient is φ = 65178812.

The previous prime is 97768217. The next prime is 97768247. The reversal of 97768221 is 12286779.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12286779 = 3 ⋅4095593.

It is a cyclic number.

It is not a de Polignac number, because 97768221 - 2² = 97768217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97768201) 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, 16294701 + ... + 16294706.

It is an arithmetic number, because the mean of its divisors is an integer number (32589408).

Almost surely, 2^97768221 is an apocalyptic number.

It is an amenable number.

97768221 is a deficient number, since it is larger than the sum of its proper divisors (32589411).

97768221 is a wasteful number, since it uses less digits than its factorization.

97768221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32589410.

The product of its digits is 84672, while the sum is 42.

The square root of 97768221 is about 9887.7813992827. The cubic root of 97768221 is about 460.6798721074.

The spelling of 97768221 in words is "ninety-seven million, seven hundred sixty-eight thousand, two hundred twenty-one".