77220814 has 16 divisors (see below), whose sum is σ = 130438656. Its totient is φ = 33967800.

The previous prime is 77220811. The next prime is 77220893. The reversal of 77220814 is 41802277.

It is a super-2 number, since 2×77220814² = 11926108229645192, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77220811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55932 + ... + 57295.

It is an arithmetic number, because the mean of its divisors is an integer number (8152416).

Almost surely, 2^77220814 is an apocalyptic number.

77220814 is a deficient number, since it is larger than the sum of its proper divisors (53217842).

77220814 is a wasteful number, since it uses less digits than its factorization.

77220814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113271.

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 77220814 is about 8787.5374252404. The cubic root of 77220814 is about 425.8383709468.

The spelling of 77220814 in words is "seventy-seven million, two hundred twenty thousand, eight hundred fourteen".