77149471 has 6 divisors (see below), whose sum is σ = 89745360. Its totient is φ = 66128076.

The previous prime is 77149463. The next prime is 77149487. The reversal of 77149471 is 17494177.

It is a happy number.

It is not a de Polignac number, because 77149471 - 2³ = 77149463 is a prime.

It is a super-3 number, since 3×77149471³ (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 (77149411) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 787191 + ... + 787288.

It is an arithmetic number, because the mean of its divisors is an integer number (14957560).

Almost surely, 2^77149471 is an apocalyptic number.

77149471 is a deficient number, since it is larger than the sum of its proper divisors (12595889).

77149471 is a wasteful number, since it uses less digits than its factorization.

77149471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1574493 (or 1574486 counting only the distinct ones).

The product of its digits is 49392, while the sum is 40.

The square root of 77149471 is about 8783.4771588477. The cubic root of 77149471 is about 425.7071889240.

The spelling of 77149471 in words is "seventy-seven million, one hundred forty-nine thousand, four hundred seventy-one".