78055440 has 40 divisors (see below), whose sum is σ = 241972608. Its totient is φ = 20814720.

The previous prime is 78055423. The next prime is 78055451. The reversal of 78055440 is 4455087.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162376 + ... + 162855.

Almost surely, 2^78055440 is an apocalyptic number.

It is an amenable number.

78055440 is an abundant number, since it is smaller than the sum of its proper divisors (163917168).

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

78055440 is a wasteful number, since it uses less digits than its factorization.

78055440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325247 (or 325241 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 33.

The square root of 78055440 is about 8834.8989807468. The cubic root of 78055440 is about 427.3670733399.

The spelling of 78055440 in words is "seventy-eight million, fifty-five thousand, four hundred forty".