77065231 has 4 divisors (see below), whose sum is σ = 77083264. Its totient is φ = 77047200.

The previous prime is 77065223. The next prime is 77065237. The reversal of 77065231 is 13256077.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 77065231 - 2³ = 77065223 is a prime.

It is a super-2 number, since 2×77065231² = 11878099658166722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77065193 and 77065202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77065237) 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, 1426 + ... + 12496.

It is an arithmetic number, because the mean of its divisors is an integer number (19270816).

Almost surely, 2^77065231 is an apocalyptic number.

77065231 is a deficient number, since it is larger than the sum of its proper divisors (18033).

77065231 is a wasteful number, since it uses less digits than its factorization.

77065231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18032.

The product of its (nonzero) digits is 8820, while the sum is 31.

The square root of 77065231 is about 8778.6804817125. The cubic root of 77065231 is about 425.5521883623.

The spelling of 77065231 in words is "seventy-seven million, sixty-five thousand, two hundred thirty-one".