78521016 has 64 divisors (see below), whose sum is σ = 231598080. Its totient is φ = 21709440.

The previous prime is 78520997. The next prime is 78521029. The reversal of 78521016 is 61012587.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2331 + ... + 12746.

It is an arithmetic number, because the mean of its divisors is an integer number (3618720).

Almost surely, 2^78521016 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 78521016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115799040).

78521016 is an abundant number, since it is smaller than the sum of its proper divisors (153077064).

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

78521016 is a wasteful number, since it uses less digits than its factorization.

78521016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15124 (or 15120 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 78521016 is about 8861.2084954593. The cubic root of 78521016 is about 428.2150926318.

The spelling of 78521016 in words is "seventy-eight million, five hundred twenty-one thousand, sixteen".