77940378 has 12 divisors (see below), whose sum is σ = 168870858. Its totient is φ = 25980120.

The previous prime is 77940377. The next prime is 77940383. The reversal of 77940378 is 87304977.

It can be written as a sum of positive squares in only one way, i.e., 73667889 + 4272489 = 8583^2 + 2067^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (77940377) 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, 2164993 + ... + 2165028.

Almost surely, 2^77940378 is an apocalyptic number.

77940378 is an abundant number, since it is smaller than the sum of its proper divisors (90930480).

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

77940378 is a wasteful number, since it uses less digits than its factorization.

77940378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4330029 (or 4330026 counting only the distinct ones).

The product of its (nonzero) digits is 296352, while the sum is 45.

The square root of 77940378 is about 8828.3847899828. The cubic root of 77940378 is about 427.1569752676.

The spelling of 77940378 in words is "seventy-seven million, nine hundred forty thousand, three hundred seventy-eight".