77221355 has 4 divisors (see below), whose sum is σ = 92665632. Its totient is φ = 61777080.

The previous prime is 77221351. The next prime is 77221367. The reversal of 77221355 is 55312277.

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

It is not a de Polignac number, because 77221355 - 2² = 77221351 is a prime.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 7722131 + ... + 7722140.

It is an arithmetic number, because the mean of its divisors is an integer number (23166408).

Almost surely, 2^77221355 is an apocalyptic number.

77221355 is a deficient number, since it is larger than the sum of its proper divisors (15444277).

77221355 is a wasteful number, since it uses less digits than its factorization.

77221355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15444276.

The product of its digits is 14700, while the sum is 32.

The square root of 77221355 is about 8787.5682074167. The cubic root of 77221355 is about 425.8393654024.

The spelling of 77221355 in words is "seventy-seven million, two hundred twenty-one thousand, three hundred fifty-five".