78091140 has 48 divisors (see below), whose sum is σ = 230166720. Its totient is φ = 19728000.

The previous prime is 78091103. The next prime is 78091147. The reversal of 78091140 is 4119087.

It is a super-2 number, since 2×78091140² = 12196452292999200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 78091098 and 78091107.

It is not an unprimeable number, because it can be changed into a prime (78091147) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33111 + ... + 35390.

It is an arithmetic number, because the mean of its divisors is an integer number (4795140).

Almost surely, 2^78091140 is an apocalyptic number.

It is an amenable number.

78091140 is an abundant number, since it is smaller than the sum of its proper divisors (152075580).

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

78091140 is a wasteful number, since it uses less digits than its factorization.

78091140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68532 (or 68530 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 78091140 is about 8836.9191463994. The cubic root of 78091140 is about 427.4322179734.

The spelling of 78091140 in words is "seventy-eight million, ninety-one thousand, one hundred forty".