97780145 has 8 divisors (see below), whose sum is σ = 117400104. Its totient is φ = 78181504.

The previous prime is 97780127. The next prime is 97780147. The reversal of 97780145 is 54108779.

It can be written as a sum of positive squares in 4 ways, for example, as 22316176 + 75463969 = 4724^2 + 8687^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 97780145 - 2²² = 93585841 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (97780147) 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 7 ways as a sum of consecutive naturals, for example, 7637 + ... + 15933.

It is an arithmetic number, because the mean of its divisors is an integer number (14675013).

Almost surely, 2^97780145 is an apocalyptic number.

It is an amenable number.

97780145 is a deficient number, since it is larger than the sum of its proper divisors (19619959).

97780145 is a wasteful number, since it uses less digits than its factorization.

97780145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10659.

The product of its (nonzero) digits is 70560, while the sum is 41.

The square root of 97780145 is about 9888.3843473037. The cubic root of 97780145 is about 460.6985998133.

The spelling of 97780145 in words is "ninety-seven million, seven hundred eighty thousand, one hundred forty-five".