76605661 has 8 divisors (see below), whose sum is σ = 85513824. Its totient is φ = 68021520.

The previous prime is 76605637. The next prime is 76605667. The reversal of 76605661 is 16650667.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 76605661 - 2⁷ = 76605533 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 76605661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76605667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80506 + ... + 81451.

It is an arithmetic number, because the mean of its divisors is an integer number (10689228).

Almost surely, 2^76605661 is an apocalyptic number.

It is an amenable number.

76605661 is a deficient number, since it is larger than the sum of its proper divisors (8908163).

76605661 is a wasteful number, since it uses less digits than its factorization.

76605661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162011.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 76605661 is about 8752.4659953638. The cubic root of 76605661 is about 424.7045900998.

The spelling of 76605661 in words is "seventy-six million, six hundred five thousand, six hundred sixty-one".