77611641 has 4 divisors (see below), whose sum is σ = 103482192. Its totient is φ = 51741092.

The previous prime is 77611621. The next prime is 77611643. The reversal of 77611641 is 14611677.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 14611677 = 3 ⋅4870559.

It is a cyclic number.

It is not a de Polignac number, because 77611641 - 2⁶ = 77611577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77611643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12935271 + ... + 12935276.

It is an arithmetic number, because the mean of its divisors is an integer number (25870548).

Almost surely, 2^77611641 is an apocalyptic number.

It is an amenable number.

77611641 is a deficient number, since it is larger than the sum of its proper divisors (25870551).

77611641 is a wasteful number, since it uses less digits than its factorization.

77611641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25870550.

The product of its digits is 7056, while the sum is 33.

The square root of 77611641 is about 8809.7469316661. The cubic root of 77611641 is about 426.5555745793. Note that the first 4 decimals are identical.

The spelling of 77611641 in words is "seventy-seven million, six hundred eleven thousand, six hundred forty-one".