97786440 has 80 divisors (see below), whose sum is σ = 328681980. Its totient is φ = 26075520.

The previous prime is 97786439. The next prime is 97786441. The reversal of 97786440 is 4468779.

It is an interprime number because it is at equal distance from previous prime (97786439) and next prime (97786441).

It can be written as a sum of positive squares in 2 ways, for example, as 96943716 + 842724 = 9846^2 + 918^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (97786441) 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 19 ways as a sum of consecutive naturals, for example, 11851 + ... + 18330.

Almost surely, 2^97786440 is an apocalyptic number.

97786440 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

97786440 is an abundant number, since it is smaller than the sum of its proper divisors (230895540).

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

97786440 is a wasteful number, since it uses less digits than its factorization.

97786440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30204 (or 30191 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The square root of 97786440 is about 9888.7026449378. The cubic root of 97786440 is about 460.7084860585.

The spelling of 97786440 in words is "ninety-seven million, seven hundred eighty-six thousand, four hundred forty".