78751378 has 16 divisors (see below), whose sum is σ = 126793080. Its totient is φ = 36550656.

The previous prime is 78751373. The next prime is 78751391. The reversal of 78751378 is 87315787.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 78375609 + 375769 = 8853^2 + 613^2 .

It is not an unprimeable number, because it can be changed into a prime (78751373) 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, 13383 + ... + 18346.

Almost surely, 2^78751378 is an apocalyptic number.

78751378 is a deficient number, since it is larger than the sum of its proper divisors (48041702).

78751378 is a wasteful number, since it uses less digits than its factorization.

78751378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31821.

The product of its digits is 329280, while the sum is 46.

The square root of 78751378 is about 8874.1973158140. The cubic root of 78751378 is about 428.6334442215.

The spelling of 78751378 in words is "seventy-eight million, seven hundred fifty-one thousand, three hundred seventy-eight".