77220143 has 24 divisors (see below), whose sum is σ = 104480544. Its totient is φ = 55535040.

The previous prime is 77220139. The next prime is 77220149. The reversal of 77220143 is 34102277.

It is not a de Polignac number, because 77220143 - 2² = 77220139 is a prime.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77220149) 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 23 ways as a sum of consecutive naturals, for example, 7505 + ... + 14517.

It is an arithmetic number, because the mean of its divisors is an integer number (4353356).

Almost surely, 2^77220143 is an apocalyptic number.

77220143 is a deficient number, since it is larger than the sum of its proper divisors (27260401).

77220143 is a wasteful number, since it uses less digits than its factorization.

77220143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7055 (or 7044 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 26.

The square root of 77220143 is about 8787.4992460882. The cubic root of 77220143 is about 425.8371375212.

The spelling of 77220143 in words is "seventy-seven million, two hundred twenty thousand, one hundred forty-three".