77690121 has 32 divisors (see below), whose sum is σ = 111796608. Its totient is φ = 47900160.

The previous prime is 77690083. The next prime is 77690131. The reversal of 77690121 is 12109677.

It is not a de Polignac number, because 77690121 - 2¹⁹ = 77165833 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (77690131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 195495 + ... + 195891.

It is an arithmetic number, because the mean of its divisors is an integer number (3493644).

Almost surely, 2^77690121 is an apocalyptic number.

It is an amenable number.

77690121 is a deficient number, since it is larger than the sum of its proper divisors (34106487).

77690121 is a wasteful number, since it uses less digits than its factorization.

77690121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521.

The product of its (nonzero) digits is 5292, while the sum is 33.

The square root of 77690121 is about 8814.1999636949. The cubic root of 77690121 is about 426.6993021776.

Adding to 77690121 its reverse (12109677), we get a palindrome (89799798).

The spelling of 77690121 in words is "seventy-seven million, six hundred ninety thousand, one hundred twenty-one".