78516240 has 80 divisors (see below), whose sum is σ = 265536576. Its totient is φ = 19033600.

The previous prime is 78516233. The next prime is 78516241. The reversal of 78516240 is 4261587.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (78516241) 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, 12231 + ... + 17510.

Almost surely, 2^78516240 is an apocalyptic number.

It is an amenable number.

78516240 is an abundant number, since it is smaller than the sum of its proper divisors (187020336).

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

78516240 is a wasteful number, since it uses less digits than its factorization.

78516240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29768 (or 29762 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 78516240 is about 8860.9390021600. The cubic root of 78516240 is about 428.2064104689.

The spelling of 78516240 in words is "seventy-eight million, five hundred sixteen thousand, two hundred forty".