97661508 has 72 divisors (see below), whose sum is σ = 271613664. Its totient is φ = 27216000.

The previous prime is 97661507. The next prime is 97661513. The reversal of 97661508 is 80516679.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 97661508.

It is not an unprimeable number, because it can be changed into a prime (97661507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22083 + ... + 26133.

It is an arithmetic number, because the mean of its divisors is an integer number (3772412).

Almost surely, 2^97661508 is an apocalyptic number.

97661508 is a gapful number since it is divisible by the number (98) 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 97661508, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135806832).

97661508 is an abundant number, since it is smaller than the sum of its proper divisors (173952156).

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

97661508 is a wasteful number, since it uses less digits than its factorization.

97661508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4113 (or 4104 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 97661508 is about 9882.3837205403. The cubic root of 97661508 is about 460.5122019871.

The spelling of 97661508 in words is "ninety-seven million, six hundred sixty-one thousand, five hundred eight".