77796521 has 4 divisors (see below), whose sum is σ = 84868944. Its totient is φ = 70724100.

The previous prime is 77796497. The next prime is 77796529. The reversal of 77796521 is 12569777.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12569777 = 11 ⋅1142707.

It is a cyclic number.

It is not a de Polignac number, because 77796521 - 2⁶ = 77796457 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 (77796529) 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 3 ways as a sum of consecutive naturals, for example, 3536195 + ... + 3536216.

It is an arithmetic number, because the mean of its divisors is an integer number (21217236).

Almost surely, 2^77796521 is an apocalyptic number.

It is an amenable number.

77796521 is a deficient number, since it is larger than the sum of its proper divisors (7072423).

77796521 is a wasteful number, since it uses less digits than its factorization.

77796521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7072422.

The product of its digits is 185220, while the sum is 44.

The square root of 77796521 is about 8820.2336136862. The cubic root of 77796521 is about 426.8940077369.

The spelling of 77796521 in words is "seventy-seven million, seven hundred ninety-six thousand, five hundred twenty-one".