78308144 has 10 divisors (see below), whose sum is σ = 151722060. Its totient is φ = 39154064.

The previous prime is 78308141. The next prime is 78308161. The reversal of 78308144 is 44180387.

It is a happy number.

It is a super-2 number, since 2×78308144² = 12264330833449472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78308141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2447114 + ... + 2447145.

It is an arithmetic number, because the mean of its divisors is an integer number (15172206).

Almost surely, 2^78308144 is an apocalyptic number.

It is an amenable number.

78308144 is a deficient number, since it is larger than the sum of its proper divisors (73413916).

78308144 is a wasteful number, since it uses less digits than its factorization.

78308144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4894267 (or 4894261 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 78308144 is about 8849.1888893842. The cubic root of 78308144 is about 427.8277759342.

The spelling of 78308144 in words is "seventy-eight million, three hundred eight thousand, one hundred forty-four".