77221436 has 12 divisors (see below), whose sum is σ = 135205728. Its totient is φ = 38591232.

The previous prime is 77221433. The next prime is 77221447. The reversal of 77221436 is 63412277.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77221433) 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, 7580 + ... + 14556.

It is an arithmetic number, because the mean of its divisors is an integer number (11267144).

Almost surely, 2^77221436 is an apocalyptic number.

It is an amenable number.

77221436 is a deficient number, since it is larger than the sum of its proper divisors (57984292).

77221436 is a wasteful number, since it uses less digits than its factorization.

77221436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9748 (or 9746 counting only the distinct ones).

The product of its digits is 14112, while the sum is 32.

The square root of 77221436 is about 8787.5728161990. The cubic root of 77221436 is about 425.8395142946.

The spelling of 77221436 in words is "seventy-seven million, two hundred twenty-one thousand, four hundred thirty-six".