77431071 has 4 divisors (see below), whose sum is σ = 103241432. Its totient is φ = 51620712.

The previous prime is 77431051. The next prime is 77431097. The reversal of 77431071 is 17013477.

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

It is not a de Polignac number, because 77431071 - 2¹⁰ = 77430047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77431051) 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 3 ways as a sum of consecutive naturals, for example, 12905176 + ... + 12905181.

It is an arithmetic number, because the mean of its divisors is an integer number (25810358).

Almost surely, 2^77431071 is an apocalyptic number.

77431071 is a deficient number, since it is larger than the sum of its proper divisors (25810361).

77431071 is a wasteful number, since it uses less digits than its factorization.

77431071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25810360.

The product of its (nonzero) digits is 4116, while the sum is 30.

The square root of 77431071 is about 8799.4926558297. The cubic root of 77431071 is about 426.2245119104.

The spelling of 77431071 in words is "seventy-seven million, four hundred thirty-one thousand, seventy-one".