77631243 has 4 divisors (see below), whose sum is σ = 103508328. Its totient is φ = 51754160.

The previous prime is 77631227. The next prime is 77631247. The reversal of 77631243 is 34213677.

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 77631243 - 2⁴ = 77631227 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77631247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12938538 + ... + 12938543.

It is an arithmetic number, because the mean of its divisors is an integer number (25877082).

Almost surely, 2^77631243 is an apocalyptic number.

77631243 is a deficient number, since it is larger than the sum of its proper divisors (25877085).

77631243 is a wasteful number, since it uses less digits than its factorization.

77631243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25877084.

The product of its digits is 21168, while the sum is 33.

The square root of 77631243 is about 8810.8593791979. The cubic root of 77631243 is about 426.5914825884.

The spelling of 77631243 in words is "seventy-seven million, six hundred thirty-one thousand, two hundred forty-three".