77643629 has 4 divisors (see below), whose sum is σ = 88735584. Its totient is φ = 66551676.

The previous prime is 77643617. The next prime is 77643647. The reversal of 77643629 is 92634677.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 77643629 - 2¹⁶ = 77578093 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 77643629.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77643529) 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, 5545967 + ... + 5545980.

It is an arithmetic number, because the mean of its divisors is an integer number (22183896).

Almost surely, 2^77643629 is an apocalyptic number.

It is an amenable number.

77643629 is a deficient number, since it is larger than the sum of its proper divisors (11091955).

77643629 is a wasteful number, since it uses less digits than its factorization.

77643629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11091954.

The product of its digits is 381024, while the sum is 44.

The square root of 77643629 is about 8811.5622337926. The cubic root of 77643629 is about 426.6141688202.

The spelling of 77643629 in words is "seventy-seven million, six hundred forty-three thousand, six hundred twenty-nine".