77320551 has 16 divisors (see below), whose sum is σ = 128533248. Its totient is φ = 40166400.

The previous prime is 77320531. The next prime is 77320561. The reversal of 77320551 is 15502377.

It is not a de Polignac number, because 77320551 - 2⁶ = 77320487 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77320501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 167130 + ... + 167591.

It is an arithmetic number, because the mean of its divisors is an integer number (8033328).

Almost surely, 2^77320551 is an apocalyptic number.

77320551 is a deficient number, since it is larger than the sum of its proper divisors (51212697).

77320551 is a wasteful number, since it uses less digits than its factorization.

77320551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334742.

The product of its (nonzero) digits is 7350, while the sum is 30.

The square root of 77320551 is about 8793.2105058391. The cubic root of 77320551 is about 426.0216271063.

The spelling of 77320551 in words is "seventy-seven million, three hundred twenty thousand, five hundred fifty-one".