97644881 has 4 divisors (see below), whose sum is σ = 98611764. Its totient is φ = 96678000.

The previous prime is 97644863. The next prime is 97644901. The reversal of 97644881 is 18844679.

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

It can be written as a sum of positive squares in 2 ways, for example, as 86787856 + 10857025 = 9316^2 + 3295^2 .

It is a cyclic number.

It is not a de Polignac number, because 97644881 - 2¹⁸ = 97382737 is a prime.

It is a super-2 number, since 2×97644881² = 19069045571008322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97644851) 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, 483290 + ... + 483491.

It is an arithmetic number, because the mean of its divisors is an integer number (24652941).

Almost surely, 2^97644881 is an apocalyptic number.

It is an amenable number.

97644881 is a deficient number, since it is larger than the sum of its proper divisors (966883).

97644881 is a wasteful number, since it uses less digits than its factorization.

97644881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 966882.

The product of its digits is 387072, while the sum is 47.

The square root of 97644881 is about 9881.5424403278. The cubic root of 97644881 is about 460.4860662348.

The spelling of 97644881 in words is "ninety-seven million, six hundred forty-four thousand, eight hundred eighty-one".