77432216 has 8 divisors (see below), whose sum is σ = 145185420. Its totient is φ = 38716104.

The previous prime is 77432209. The next prime is 77432219. The reversal of 77432216 is 61223477.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77432219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4839506 + ... + 4839521.

Almost surely, 2^77432216 is an apocalyptic number.

It is an amenable number.

77432216 is a deficient number, since it is larger than the sum of its proper divisors (67753204).

77432216 is a wasteful number, since it uses less digits than its factorization.

77432216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9679033 (or 9679029 counting only the distinct ones).

The product of its digits is 14112, while the sum is 32.

The square root of 77432216 is about 8799.5577161582. The cubic root of 77432216 is about 426.2266128097.

The spelling of 77432216 in words is "seventy-seven million, four hundred thirty-two thousand, two hundred sixteen".