77138307 has 6 divisors (see below), whose sum is σ = 111422012. Its totient is φ = 51425532.

The previous prime is 77138287. The next prime is 77138329. The reversal of 77138307 is 70383177.

It is a happy number.

It is not a de Polignac number, because 77138307 - 2¹⁴ = 77121923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77138357) 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, 4285453 + ... + 4285470.

Almost surely, 2^77138307 is an apocalyptic number.

77138307 is a deficient number, since it is larger than the sum of its proper divisors (34283705).

77138307 is a wasteful number, since it uses less digits than its factorization.

77138307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8570929 (or 8570926 counting only the distinct ones).

The product of its (nonzero) digits is 24696, while the sum is 36.

The square root of 77138307 is about 8782.8416244402. The cubic root of 77138307 is about 425.6866537894.

It can be divided in two parts, 77 and 138307, that added together give a square (138384 = 372²).

The spelling of 77138307 in words is "seventy-seven million, one hundred thirty-eight thousand, three hundred seven".