78880140 has 36 divisors (see below), whose sum is σ = 239270304. Its totient is φ = 21034656.

The previous prime is 78880117. The next prime is 78880141. The reversal of 78880140 is 4108887.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 78880095 and 78880104.

It is not an unprimeable number, because it can be changed into a prime (78880141) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 218932 + ... + 219291.

Almost surely, 2^78880140 is an apocalyptic number.

It is an amenable number.

78880140 is an abundant number, since it is smaller than the sum of its proper divisors (160390164).

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

78880140 is a wasteful number, since it uses less digits than its factorization.

78880140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438238 (or 438233 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 36.

The square root of 78880140 is about 8881.4492060699. The cubic root of 78880140 is about 428.8669285869.

The spelling of 78880140 in words is "seventy-eight million, eight hundred eighty thousand, one hundred forty".