97772781 has 8 divisors (see below), whose sum is σ = 130667904. Its totient is φ = 65029760.

The previous prime is 97772777. The next prime is 97772827. The reversal of 97772781 is 18727779.

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

It is a cyclic number.

It is not a de Polignac number, because 97772781 - 2² = 97772777 is a prime.

It is a super-2 number, since 2×97772781² = 19119033408947922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 97772781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97772711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36516 + ... + 39101.

It is an arithmetic number, because the mean of its divisors is an integer number (16333488).

Almost surely, 2^97772781 is an apocalyptic number.

It is an amenable number.

97772781 is a deficient number, since it is larger than the sum of its proper divisors (32895123).

97772781 is a wasteful number, since it uses less digits than its factorization.

97772781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76051.

The product of its digits is 345744, while the sum is 48.

The square root of 97772781 is about 9888.0119842160. The cubic root of 97772781 is about 460.6870341741.

The spelling of 97772781 in words is "ninety-seven million, seven hundred seventy-two thousand, seven hundred eighty-one".