77231378 has 16 divisors (see below), whose sum is σ = 138153600. Its totient is φ = 31659936.

The previous prime is 77231377. The next prime is 77231381. The reversal of 77231378 is 87313277.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (77231377) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119603 + ... + 120246.

It is an arithmetic number, because the mean of its divisors is an integer number (8634600).

Almost surely, 2^77231378 is an apocalyptic number.

77231378 is a deficient number, since it is larger than the sum of its proper divisors (60922222).

77231378 is a wasteful number, since it uses less digits than its factorization.

77231378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239881.

The product of its digits is 49392, while the sum is 38.

The square root of 77231378 is about 8788.1384832056. The cubic root of 77231378 is about 425.8577886452.

The spelling of 77231378 in words is "seventy-seven million, two hundred thirty-one thousand, three hundred seventy-eight".