77755321 has 8 divisors (see below), whose sum is σ = 88994240. Its totient is φ = 66549168.

The previous prime is 77755319. The next prime is 77755339. The reversal of 77755321 is 12355777.

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

It is not a de Polignac number, because 77755321 - 2¹ = 77755319 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (77755361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2871 + ... + 12796.

It is an arithmetic number, because the mean of its divisors is an integer number (11124280).

Almost surely, 2^77755321 is an apocalyptic number.

It is an amenable number.

77755321 is a deficient number, since it is larger than the sum of its proper divisors (11238919).

77755321 is a wasteful number, since it uses less digits than its factorization.

77755321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16383.

The product of its digits is 51450, while the sum is 37.

The square root of 77755321 is about 8817.8977653407. The cubic root of 77755321 is about 426.8186353055.

The spelling of 77755321 in words is "seventy-seven million, seven hundred fifty-five thousand, three hundred twenty-one".