77127138 has 24 divisors (see below), whose sum is σ = 182300976. Its totient is φ = 23371800.

The previous prime is 77127103. The next prime is 77127139. The reversal of 77127138 is 83172177.

It is a happy number.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (77127139) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 194568 + ... + 194963.

It is an arithmetic number, because the mean of its divisors is an integer number (7595874).

Almost surely, 2^77127138 is an apocalyptic number.

77127138 is an abundant number, since it is smaller than the sum of its proper divisors (105173838).

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

77127138 is a wasteful number, since it uses less digits than its factorization.

77127138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389550 (or 389547 counting only the distinct ones).

The product of its digits is 16464, while the sum is 36.

The square root of 77127138 is about 8782.2057593750. The cubic root of 77127138 is about 425.6661074750. Note that the first 3 decimals are identical.

The spelling of 77127138 in words is "seventy-seven million, one hundred twenty-seven thousand, one hundred thirty-eight".