77731738 has 12 divisors (see below), whose sum is σ = 135634122. Its totient is φ = 33313560.

The previous prime is 77731657. The next prime is 77731739. The reversal of 77731738 is 83713777.

It can be written as a sum of positive squares in only one way, i.e., 53100369 + 24631369 = 7287^2 + 4963^2 .

It is a junction number, because it is equal to n+sod(n) for n = 77731694 and 77731703.

It is not an unprimeable number, because it can be changed into a prime (77731739) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 396493 + ... + 396688.

Almost surely, 2^77731738 is an apocalyptic number.

77731738 is a deficient number, since it is larger than the sum of its proper divisors (57902384).

77731738 is a wasteful number, since it uses less digits than its factorization.

77731738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 793197 (or 793190 counting only the distinct ones).

The product of its digits is 172872, while the sum is 43.

The square root of 77731738 is about 8816.5604404439. The cubic root of 77731738 is about 426.7754799237.

The spelling of 77731738 in words is "seventy-seven million, seven hundred thirty-one thousand, seven hundred thirty-eight".