77830661 has 4 divisors (see below), whose sum is σ = 77848524. Its totient is φ = 77812800.

The previous prime is 77830639. The next prime is 77830667. The reversal of 77830661 is 16603877.

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

It can be written as a sum of positive squares in 2 ways, for example, as 24453025 + 53377636 = 4945^2 + 7306^2 .

It is a cyclic number.

It is not a de Polignac number, because 77830661 - 2¹⁰ = 77829637 is a prime.

It is a super-2 number, since 2×77830661² = 12115223583393842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77830667) 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, 2381 + ... + 12701.

It is an arithmetic number, because the mean of its divisors is an integer number (19462131).

Almost surely, 2^77830661 is an apocalyptic number.

It is an amenable number.

77830661 is a deficient number, since it is larger than the sum of its proper divisors (17863).

77830661 is a wasteful number, since it uses less digits than its factorization.

77830661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17862.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 77830661 is about 8822.1687242990. The cubic root of 77830661 is about 426.9564442480.

The spelling of 77830661 in words is "seventy-seven million, eight hundred thirty thousand, six hundred sixty-one".