77520601 has 4 divisors (see below), whose sum is σ = 77542452. Its totient is φ = 77498752.

The previous prime is 77520571. The next prime is 77520607. The reversal of 77520601 is 10602577.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10602577 = 17 ⋅623681.

It can be written as a sum of positive squares in 2 ways, for example, as 35283600 + 42237001 = 5940^2 + 6499^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77520601 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77520601.

It is not an unprimeable number, because it can be changed into a prime (77520607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4240 + ... + 13153.

It is an arithmetic number, because the mean of its divisors is an integer number (19385613).

Almost surely, 2^77520601 is an apocalyptic number.

It is an amenable number.

77520601 is a deficient number, since it is larger than the sum of its proper divisors (21851).

77520601 is a wasteful number, since it uses less digits than its factorization.

77520601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21850.

The product of its (nonzero) digits is 2940, while the sum is 28.

The square root of 77520601 is about 8804.5784112585. The cubic root of 77520601 is about 426.3887232620.

The spelling of 77520601 in words is "seventy-seven million, five hundred twenty thousand, six hundred one".