97782565 has 8 divisors (see below), whose sum is σ = 117467928. Its totient is φ = 78140160.

The previous prime is 97782563. The next prime is 97782571. The reversal of 97782565 is 56528779.

It can be written as a sum of positive squares in 4 ways, for example, as 11682724 + 86099841 = 3418^2 + 9279^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 97782565 - 2¹ = 97782563 is a prime.

It is a super-2 number, since 2×97782565² = 19122860035958450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97782563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5496 + ... + 15025.

It is an arithmetic number, because the mean of its divisors is an integer number (14683491).

Almost surely, 2^97782565 is an apocalyptic number.

It is an amenable number.

97782565 is a deficient number, since it is larger than the sum of its proper divisors (19685363).

97782565 is a wasteful number, since it uses less digits than its factorization.

97782565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21479.

The product of its digits is 1058400, while the sum is 49.

The square root of 97782565 is about 9888.5067123403. The cubic root of 97782565 is about 460.7024004534.

The spelling of 97782565 in words is "ninety-seven million, seven hundred eighty-two thousand, five hundred sixty-five".