77220355 has 4 divisors (see below), whose sum is σ = 92664432. Its totient is φ = 61776280.

The previous prime is 77220347. The next prime is 77220371. The reversal of 77220355 is 55302277.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55302277 = 127 ⋅435451.

It is not a de Polignac number, because 77220355 - 2³ = 77220347 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7722031 + ... + 7722040.

It is an arithmetic number, because the mean of its divisors is an integer number (23166108).

Almost surely, 2^77220355 is an apocalyptic number.

77220355 is a deficient number, since it is larger than the sum of its proper divisors (15444077).

77220355 is a wasteful number, since it uses less digits than its factorization.

77220355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15444076.

The product of its (nonzero) digits is 14700, while the sum is 31.

The square root of 77220355 is about 8787.5113086698. The cubic root of 77220355 is about 425.8375272183.

The spelling of 77220355 in words is "seventy-seven million, two hundred twenty thousand, three hundred fifty-five".