77325621 has 4 divisors (see below), whose sum is σ = 103100832. Its totient is φ = 51550412.

The previous prime is 77325593. The next prime is 77325679. The reversal of 77325621 is 12652377.

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: 12652377 = 3 ⋅4217459.

It is a cyclic number.

It is not a de Polignac number, because 77325621 - 2²³ = 68937013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77325691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12887601 + ... + 12887606.

It is an arithmetic number, because the mean of its divisors is an integer number (25775208).

Almost surely, 2^77325621 is an apocalyptic number.

It is an amenable number.

77325621 is a deficient number, since it is larger than the sum of its proper divisors (25775211).

77325621 is a wasteful number, since it uses less digits than its factorization.

77325621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25775210.

The product of its digits is 17640, while the sum is 33.

The square root of 77325621 is about 8793.4987917211. The cubic root of 77325621 is about 426.0309384835.

Adding to 77325621 its reverse (12652377), we get a palindrome (89977998).

The spelling of 77325621 in words is "seventy-seven million, three hundred twenty-five thousand, six hundred twenty-one".