77649471 has 12 divisors (see below), whose sum is σ = 112568872. Its totient is φ = 51577776.

The previous prime is 77649463. The next prime is 77649479. The reversal of 77649471 is 17494677.

It is an interprime number because it is at equal distance from previous prime (77649463) and next prime (77649479).

It is not a de Polignac number, because 77649471 - 2³ = 77649463 is a prime.

It is a super-3 number, since 3×77649471³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77649479) 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, 13081 + ... + 18066.

Almost surely, 2^77649471 is an apocalyptic number.

77649471 is a deficient number, since it is larger than the sum of its proper divisors (34919401).

77649471 is a wasteful number, since it uses less digits than its factorization.

77649471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31430 (or 31427 counting only the distinct ones).

The product of its digits is 296352, while the sum is 45.

The square root of 77649471 is about 8811.8937238258. The cubic root of 77649471 is about 426.6248682062.

The spelling of 77649471 in words is "seventy-seven million, six hundred forty-nine thousand, four hundred seventy-one".