97209720 has 192 divisors, whose sum is σ = 334545120. Its totient is φ = 25380864.

The previous prime is 97209703. The next prime is 97209731. The reversal of 97209720 is 2790279.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 709492 + ... + 709628.

Almost surely, 2^97209720 is an apocalyptic number.

97209720 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 97209720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (167272560).

97209720 is an abundant number, since it is smaller than the sum of its proper divisors (237335400).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

97209720 is a wasteful number, since it uses less digits than its factorization.

97209720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236 (or 220 counting only the distinct ones).

The product of its (nonzero) digits is 15876, while the sum is 36.

The square root of 97209720 is about 9859.4989730716. The cubic root of 97209720 is about 459.8009851139.

Adding to 97209720 its reverse (2790279), we get a palindrome (99999999).

The spelling of 97209720 in words is "ninety-seven million, two hundred nine thousand, seven hundred twenty".