78280016 has 10 divisors (see below), whose sum is σ = 151667562. Its totient is φ = 39140000.

The previous prime is 78280009. The next prime is 78280021. The reversal of 78280016 is 61008287.

It can be written as a sum of positive squares in only one way, i.e., 56190016 + 22090000 = 7496^2 + 4700^2 .

It is a super-2 number, since 2×78280016² = 12255521809920512, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2446235 + ... + 2446266.

Almost surely, 2^78280016 is an apocalyptic number.

It is an amenable number.

78280016 is a deficient number, since it is larger than the sum of its proper divisors (73387546).

78280016 is a wasteful number, since it uses less digits than its factorization.

78280016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4892509 (or 4892503 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 78280016 is about 8847.5994484380. The cubic root of 78280016 is about 427.7765450737.

The spelling of 78280016 in words is "seventy-eight million, two hundred eighty thousand, sixteen".