77712641 has 4 divisors (see below), whose sum is σ = 81802800. Its totient is φ = 73622484.

The previous prime is 77712637. The next prime is 77712659. The reversal of 77712641 is 14621777.

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: 14621777 = 103 ⋅141959.

It is a cyclic number.

It is not a de Polignac number, because 77712641 - 2² = 77712637 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77712611) 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, 2045051 + ... + 2045088.

It is an arithmetic number, because the mean of its divisors is an integer number (20450700).

Almost surely, 2^77712641 is an apocalyptic number.

It is an amenable number.

77712641 is a deficient number, since it is larger than the sum of its proper divisors (4090159).

77712641 is a wasteful number, since it uses less digits than its factorization.

77712641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4090158.

The product of its digits is 16464, while the sum is 35.

The square root of 77712641 is about 8815.4773551975. The cubic root of 77712641 is about 426.7405272387.

The spelling of 77712641 in words is "seventy-seven million, seven hundred twelve thousand, six hundred forty-one".