77776641 has 12 divisors (see below), whose sum is σ = 112508032. Its totient is φ = 51775416.

The previous prime is 77776619. The next prime is 77776661. The reversal of 77776641 is 14667777.

It is not a de Polignac number, because 77776641 - 2⁶ = 77776577 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (77776661) 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, 600 + ... + 12486.

Almost surely, 2^77776641 is an apocalyptic number.

It is an amenable number.

77776641 is a deficient number, since it is larger than the sum of its proper divisors (34731391).

77776641 is a wasteful number, since it uses less digits than its factorization.

77776641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12620 (or 12617 counting only the distinct ones).

The product of its digits is 345744, while the sum is 45.

The square root of 77776641 is about 8819.1065874044. The cubic root of 77776641 is about 426.8576420325.

The spelling of 77776641 in words is "seventy-seven million, seven hundred seventy-six thousand, six hundred forty-one".