78021560 has 16 divisors (see below), whose sum is σ = 175548600. Its totient is φ = 31208608.

The previous prime is 78021557. The next prime is 78021569. The reversal of 78021560 is 6512087.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78021569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 975230 + ... + 975309.

Almost surely, 2^78021560 is an apocalyptic number.

It is an amenable number.

78021560 is an abundant number, since it is smaller than the sum of its proper divisors (97527040).

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

78021560 is a wasteful number, since it uses less digits than its factorization.

78021560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1950550 (or 1950546 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 78021560 is about 8832.9813766361. The cubic root of 78021560 is about 427.3052314326.

The spelling of 78021560 in words is "seventy-eight million, twenty-one thousand, five hundred sixty".