77638390 has 8 divisors (see below), whose sum is σ = 139749120. Its totient is φ = 31055352.

The previous prime is 77638361. The next prime is 77638399. The reversal of 77638390 is 9383677.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77638399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3881910 + ... + 3881929.

It is an arithmetic number, because the mean of its divisors is an integer number (17468640).

Almost surely, 2^77638390 is an apocalyptic number.

77638390 is a deficient number, since it is larger than the sum of its proper divisors (62110730).

77638390 is a wasteful number, since it uses less digits than its factorization.

77638390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7763846.

The product of its (nonzero) digits is 190512, while the sum is 43.

The square root of 77638390 is about 8811.2649489162. The cubic root of 77638390 is about 426.6045733478.

The spelling of 77638390 in words is "seventy-seven million, six hundred thirty-eight thousand, three hundred ninety".