97778657 has 4 divisors (see below), whose sum is σ = 97806996. Its totient is φ = 97750320.

The previous prime is 97778641. The next prime is 97778663. The reversal of 97778657 is 75687779.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75687779 = 23 ⋅3290773.

It can be written as a sum of positive squares in 2 ways, for example, as 31990336 + 65788321 = 5656^2 + 8111^2 .

It is a cyclic number.

It is not a de Polignac number, because 97778657 - 2⁴ = 97778641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97778627) 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, 8138 + ... + 16179.

It is an arithmetic number, because the mean of its divisors is an integer number (24451749).

Almost surely, 2^97778657 is an apocalyptic number.

It is an amenable number.

97778657 is a deficient number, since it is larger than the sum of its proper divisors (28339).

97778657 is a wasteful number, since it uses less digits than its factorization.

97778657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28338.

The product of its digits is 5186160, while the sum is 56.

The square root of 97778657 is about 9888.3091072235. The cubic root of 97778657 is about 460.6962628597.

The spelling of 97778657 in words is "ninety-seven million, seven hundred seventy-eight thousand, six hundred fifty-seven".