78532540 has 24 divisors (see below), whose sum is σ = 167716080. Its totient is φ = 30880128.

The previous prime is 78532477. The next prime is 78532541. The reversal of 78532540 is 4523587.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 78532496 and 78532505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78532541) 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, 32097 + ... + 34456.

It is an arithmetic number, because the mean of its divisors is an integer number (6988170).

Almost surely, 2^78532540 is an apocalyptic number.

It is an amenable number.

78532540 is an abundant number, since it is smaller than the sum of its proper divisors (89183540).

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

78532540 is a wasteful number, since it uses less digits than its factorization.

78532540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66621 (or 66619 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 34.

The square root of 78532540 is about 8861.8587215098. The cubic root of 78532540 is about 428.2360403542.

The spelling of 78532540 in words is "seventy-eight million, five hundred thirty-two thousand, five hundred forty".