77221446 has 32 divisors (see below), whose sum is σ = 165846528. Its totient is φ = 23882880.

The previous prime is 77221433. The next prime is 77221447. The reversal of 77221446 is 64412277.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77221447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1911 + ... + 12573.

It is an arithmetic number, because the mean of its divisors is an integer number (5182704).

Almost surely, 2^77221446 is an apocalyptic number.

77221446 is an abundant number, since it is smaller than the sum of its proper divisors (88625082).

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

77221446 is a wasteful number, since it uses less digits than its factorization.

77221446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10756.

The product of its digits is 18816, while the sum is 33.

The square root of 77221446 is about 8787.5733851843. The cubic root of 77221446 is about 425.8395326764.

The spelling of 77221446 in words is "seventy-seven million, two hundred twenty-one thousand, four hundred forty-six".