77698601 has 4 divisors (see below), whose sum is σ = 77808900. Its totient is φ = 77588304.

The previous prime is 77698597. The next prime is 77698603. The reversal of 77698601 is 10689677.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10689677 = 1289 ⋅8293.

It can be written as a sum of positive squares in 2 ways, for example, as 5040025 + 72658576 = 2245^2 + 8524^2 .

It is a cyclic number.

It is not a de Polignac number, because 77698601 - 2² = 77698597 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77698603) 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 3 ways as a sum of consecutive naturals, for example, 54086 + ... + 55503.

It is an arithmetic number, because the mean of its divisors is an integer number (19452225).

Almost surely, 2^77698601 is an apocalyptic number.

It is an amenable number.

77698601 is a deficient number, since it is larger than the sum of its proper divisors (110299).

77698601 is a wasteful number, since it uses less digits than its factorization.

77698601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110298.

The product of its (nonzero) digits is 127008, while the sum is 44.

The square root of 77698601 is about 8814.6809925260. The cubic root of 77698601 is about 426.7148265814.

The spelling of 77698601 in words is "seventy-seven million, six hundred ninety-eight thousand, six hundred one".