77445431406 has 24 divisors (see below), whose sum is σ = 191769639984. Its totient is φ = 22127266080.

The previous prime is 77445431347. The next prime is 77445431411. The reversal of 77445431406 is 60413454477.

It is a super-2 number, since 2×77445431406² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 307323015 + ... + 307323266.

It is an arithmetic number, because the mean of its divisors is an integer number (7990401666).

Almost surely, 2^77445431406 is an apocalyptic number.

77445431406 is an abundant number, since it is smaller than the sum of its proper divisors (114324208578).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77445431406 is a wasteful number, since it uses less digits than its factorization.

77445431406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 614646296 (or 614646293 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 45.

The spelling of 77445431406 in words is "seventy-seven billion, four hundred forty-five million, four hundred thirty-one thousand, four hundred six".