77628394 has 4 divisors (see below), whose sum is σ = 116442594. Its totient is φ = 38814196.

The previous prime is 77628391. The next prime is 77628403. The reversal of 77628394 is 49382677.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 64400625 + 13227769 = 8025^2 + 3637^2 .

It is not an unprimeable number, because it can be changed into a prime (77628391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19407097 + ... + 19407100.

Almost surely, 2^77628394 is an apocalyptic number.

77628394 is a deficient number, since it is larger than the sum of its proper divisors (38814200).

77628394 is a wasteful number, since it uses less digits than its factorization.

77628394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38814199.

The product of its digits is 508032, while the sum is 46.

The square root of 77628394 is about 8810.6977022254. The cubic root of 77628394 is about 426.5862640108.

The spelling of 77628394 in words is "seventy-seven million, six hundred twenty-eight thousand, three hundred ninety-four".