77628949 has 8 divisors (see below), whose sum is σ = 80055360. Its totient is φ = 75228000.

The previous prime is 77628883. The next prime is 77628959. The reversal of 77628949 is 94982677.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77628949 - 2²⁵ = 44074517 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77628896 and 77628905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77628959) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79 + ... + 12460.

It is an arithmetic number, because the mean of its divisors is an integer number (10006920).

Almost surely, 2^77628949 is an apocalyptic number.

It is an amenable number.

77628949 is a deficient number, since it is larger than the sum of its proper divisors (2426411).

77628949 is a wasteful number, since it uses less digits than its factorization.

77628949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12731.

The product of its digits is 1524096, while the sum is 52.

The square root of 77628949 is about 8810.7291979722. The cubic root of 77628949 is about 426.5872806269.

The spelling of 77628949 in words is "seventy-seven million, six hundred twenty-eight thousand, nine hundred forty-nine".