77720285 has 8 divisors (see below), whose sum is σ = 93336576. Its totient is φ = 62128080.

The previous prime is 77720267. The next prime is 77720299. The reversal of 77720285 is 58202777.

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

It is not a de Polignac number, because 77720285 - 2¹² = 77716189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2072 + ... + 12638.

It is an arithmetic number, because the mean of its divisors is an integer number (11667072).

Almost surely, 2^77720285 is an apocalyptic number.

It is an amenable number.

77720285 is a deficient number, since it is larger than the sum of its proper divisors (15616291).

77720285 is a wasteful number, since it uses less digits than its factorization.

77720285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12043.

The product of its (nonzero) digits is 54880, while the sum is 38.

The square root of 77720285 is about 8815.9109001850. The cubic root of 77720285 is about 426.7545185173.

The spelling of 77720285 in words is "seventy-seven million, seven hundred twenty thousand, two hundred eighty-five".