77777231 has 8 divisors (see below), whose sum is σ = 89478144. Its totient is φ = 66223800.

The previous prime is 77777221. The next prime is 77777251. The reversal of 77777231 is 13277777.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77777231 is a prime.

It is a super-2 number, since 2×77777231² = 12098595324054722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77777221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35735 + ... + 37848.

It is an arithmetic number, because the mean of its divisors is an integer number (11184768).

Almost surely, 2^77777231 is an apocalyptic number.

77777231 is a deficient number, since it is larger than the sum of its proper divisors (11700913).

77777231 is a wasteful number, since it uses less digits than its factorization.

77777231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73741.

The product of its digits is 100842, while the sum is 41.

The square root of 77777231 is about 8819.1400374413. The cubic root of 77777231 is about 426.8587213855.

The spelling of 77777231 in words is "seventy-seven million, seven hundred seventy-seven thousand, two hundred thirty-one".