77671408 has 20 divisors (see below), whose sum is σ = 151120288. Its totient is φ = 38672640.

The previous prime is 77671403. The next prime is 77671427. The reversal of 77671408 is 80417677.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77671403) 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, 6216 + ... + 13927.

Almost surely, 2^77671408 is an apocalyptic number.

It is an amenable number.

77671408 is a deficient number, since it is larger than the sum of its proper divisors (73448880).

77671408 is a wasteful number, since it uses less digits than its factorization.

77671408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20392 (or 20386 counting only the distinct ones).

The product of its (nonzero) digits is 65856, while the sum is 40.

The square root of 77671408 is about 8813.1383740413. The cubic root of 77671408 is about 426.6650401414.

The spelling of 77671408 in words is "seventy-seven million, six hundred seventy-one thousand, four hundred eight".