77561122 has 4 divisors (see below), whose sum is σ = 116341686. Its totient is φ = 38780560.

The previous prime is 77561119. The next prime is 77561131. The reversal of 77561122 is 22116577.

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

It can be written as a sum of positive squares in only one way, i.e., 71757841 + 5803281 = 8471^2 + 2409^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19390279 + ... + 19390282.

Almost surely, 2^77561122 is an apocalyptic number.

77561122 is a deficient number, since it is larger than the sum of its proper divisors (38780564).

77561122 is a wasteful number, since it uses less digits than its factorization.

77561122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38780563.

The product of its digits is 5880, while the sum is 31.

The square root of 77561122 is about 8806.8792429555. The cubic root of 77561122 is about 426.4630032499.

Adding to 77561122 its reverse (22116577), we get a palindrome (99677699).

The spelling of 77561122 in words is "seventy-seven million, five hundred sixty-one thousand, one hundred twenty-two".