78540340 has 24 divisors (see below), whose sum is σ = 174637512. Its totient is φ = 29568000.

The previous prime is 78540313. The next prime is 78540347. The reversal of 78540340 is 4304587.

It can be written as a sum of positive squares in 4 ways, for example, as 1170724 + 77369616 = 1082^2 + 8796^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78540347) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115161 + ... + 115840.

It is an arithmetic number, because the mean of its divisors is an integer number (7276563).

Almost surely, 2^78540340 is an apocalyptic number.

It is an amenable number.

78540340 is an abundant number, since it is smaller than the sum of its proper divisors (96097172).

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

78540340 is a wasteful number, since it uses less digits than its factorization.

78540340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231027 (or 231025 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 78540340 is about 8862.2987988445. The cubic root of 78540340 is about 428.2502176219.

The spelling of 78540340 in words is "seventy-eight million, five hundred forty thousand, three hundred forty".