78687576 has 96 divisors (see below), whose sum is σ = 235843920. Its totient is φ = 23500800.

The previous prime is 78687559. The next prime is 78687589. The reversal of 78687576 is 67578687.

78687576 is a `hidden beast` number, since 7 + 8 + 68 + 7 + 576 = 666.

It is a nialpdrome in base 14.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57136 + ... + 58496.

Almost surely, 2^78687576 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78687576, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117921960).

78687576 is an abundant number, since it is smaller than the sum of its proper divisors (157156344).

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

78687576 is a wasteful number, since it uses less digits than its factorization.

78687576 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1457 (or 1450 counting only the distinct ones).

The product of its digits is 3951360, while the sum is 54.

The square root of 78687576 is about 8870.6017834192. The cubic root of 78687576 is about 428.5176576348.

Subtracting from 78687576 its reverse (67578687), we obtain a square (11108889 = 3333²).

The spelling of 78687576 in words is "seventy-eight million, six hundred eighty-seven thousand, five hundred seventy-six".