77630661 has 12 divisors (see below), whose sum is σ = 113126988. Its totient is φ = 51295104.

The previous prime is 77630659. The next prime is 77630669. The reversal of 77630661 is 16603677.

It can be written as a sum of positive squares in 2 ways, for example, as 7322436 + 70308225 = 2706^2 + 8385^2 .

It is not a de Polignac number, because 77630661 - 2¹ = 77630659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77630669) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37150 + ... + 39183.

It is an arithmetic number, because the mean of its divisors is an integer number (9427249).

Almost surely, 2^77630661 is an apocalyptic number.

It is an amenable number.

77630661 is a deficient number, since it is larger than the sum of its proper divisors (35496327).

77630661 is a wasteful number, since it uses less digits than its factorization.

77630661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76452 (or 76449 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 36.

The square root of 77630661 is about 8810.8263517107. The cubic root of 77630661 is about 426.5904165363.

The spelling of 77630661 in words is "seventy-seven million, six hundred thirty thousand, six hundred sixty-one".