97821087 has 48 divisors (see below), whose sum is σ = 165420288. Its totient is φ = 50319360.

The previous prime is 97821083. The next prime is 97821091. The reversal of 97821087 is 78012879.

It is an interprime number because it is at equal distance from previous prime (97821083) and next prime (97821091).

It is not a de Polignac number, because 97821087 - 2² = 97821083 is a prime.

97821087 is a Rhonda number in base 6.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97821083) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 152287 + ... + 152927.

It is an arithmetic number, because the mean of its divisors is an integer number (3446256).

Almost surely, 2^97821087 is an apocalyptic number.

97821087 is a deficient number, since it is larger than the sum of its proper divisors (67599201).

97821087 is a wasteful number, since it uses less digits than its factorization.

97821087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720 (or 707 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 42.

The square root of 97821087 is about 9890.4543373902. The cubic root of 97821087 is about 460.7628912913.

The spelling of 97821087 in words is "ninety-seven million, eight hundred twenty-one thousand, eighty-seven".