78277223 has 2 divisors, whose sum is σ = 78277224. Its totient is φ = 78277222.

The previous prime is 78277193. The next prime is 78277249. The reversal of 78277223 is 32277287.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78277223 - 2¹⁸ = 78015079 is a prime.

It is a super-2 number, since 2×78277223² = 12254647281183458, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78277123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39138611 + 39138612.

It is an arithmetic number, because the mean of its divisors is an integer number (39138612).

Almost surely, 2^78277223 is an apocalyptic number.

78277223 is a deficient number, since it is larger than the sum of its proper divisors (1).

78277223 is an equidigital number, since it uses as much as digits as its factorization.

78277223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 65856, while the sum is 38.

The square root of 78277223 is about 8847.4416076061. The cubic root of 78277223 is about 427.7714573806.

The spelling of 78277223 in words is "seventy-eight million, two hundred seventy-seven thousand, two hundred twenty-three".