77438538 has 32 divisors (see below), whose sum is σ = 173243520. Its totient is φ = 25639200.

The previous prime is 77438531. The next prime is 77438551. The reversal of 77438538 is 83583477.

77438538 is a `hidden beast` number, since 77 + 43 + 8 + 538 = 666.

It is a super-3 number, since 3×77438538³ (a number of 25 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77438493 and 77438502.

It is not an unprimeable number, because it can be changed into a prime (77438531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3406 + ... + 12902.

It is an arithmetic number, because the mean of its divisors is an integer number (5413860).

Almost surely, 2^77438538 is an apocalyptic number.

77438538 is an abundant number, since it is smaller than the sum of its proper divisors (95804982).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77438538 is a wasteful number, since it uses less digits than its factorization.

77438538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9659 (or 9653 counting only the distinct ones).

The product of its digits is 564480, while the sum is 45.

The square root of 77438538 is about 8799.9169314261. The cubic root of 77438538 is about 426.2382123370.

The spelling of 77438538 in words is "seventy-seven million, four hundred thirty-eight thousand, five hundred thirty-eight".