77221356 has 24 divisors (see below), whose sum is σ = 181562304. Its totient is φ = 25543440.

The previous prime is 77221351. The next prime is 77221367. The reversal of 77221356 is 65312277.

It is not an unprimeable number, because it can be changed into a prime (77221351) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22990 + ... + 26133.

It is an arithmetic number, because the mean of its divisors is an integer number (7565096).

Almost surely, 2^77221356 is an apocalyptic number.

It is an amenable number.

77221356 is an abundant number, since it is smaller than the sum of its proper divisors (104340948).

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

77221356 is a wasteful number, since it uses less digits than its factorization.

77221356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49261 (or 49259 counting only the distinct ones).

The product of its digits is 17640, while the sum is 33.

The square root of 77221356 is about 8787.5682643152. The cubic root of 77221356 is about 425.8393672406.

It can be divided in two parts, 77221 and 356, that added together give a palindrome (77577).

The spelling of 77221356 in words is "seventy-seven million, two hundred twenty-one thousand, three hundred fifty-six".