78428016 has 60 divisors (see below), whose sum is σ = 226582720. Its totient is φ = 25297920.

The previous prime is 78427931. The next prime is 78428017. The reversal of 78428016 is 61082487.

78428016 = 1550² + 1551² + ... + 1581².

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78428017) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4321 + ... + 13248.

Almost surely, 2^78428016 is an apocalyptic number.

It is an amenable number.

78428016 is an abundant number, since it is smaller than the sum of its proper divisors (148154704).

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

78428016 is a wasteful number, since it uses less digits than its factorization.

78428016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17614 (or 17605 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 78428016 is about 8855.9593495002. The cubic root of 78428016 is about 428.0459670547.

The spelling of 78428016 in words is "seventy-eight million, four hundred twenty-eight thousand, sixteen".