78540189 has 48 divisors (see below), whose sum is σ = 133221312. Its totient is φ = 40787712.

The previous prime is 78540139. The next prime is 78540211. The reversal of 78540189 is 98104587.

It is not a de Polignac number, because 78540189 - 2⁷ = 78540061 is a prime.

It is a super-2 number, since 2×78540189² = 12337122576311442, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78540189.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78540139) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 139222 + ... + 139784.

It is an arithmetic number, because the mean of its divisors is an integer number (2775444).

Almost surely, 2^78540189 is an apocalyptic number.

It is an amenable number.

78540189 is a deficient number, since it is larger than the sum of its proper divisors (54681123).

78540189 is a wasteful number, since it uses less digits than its factorization.

78540189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666 (or 659 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 42.

The square root of 78540189 is about 8862.2902796061. The cubic root of 78540189 is about 428.2499431735.

The spelling of 78540189 in words is "seventy-eight million, five hundred forty thousand, one hundred eighty-nine".