78480819 has 20 divisors (see below), whose sum is σ = 117776560. Its totient is φ = 52079760.

The previous prime is 78480803. The next prime is 78480821. The reversal of 78480819 is 91808487.

It is not a de Polignac number, because 78480819 - 2⁴ = 78480803 is a prime.

It is a super-2 number, since 2×78480819² = 12318477901821522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78480839) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 16434 + ... + 20664.

It is an arithmetic number, because the mean of its divisors is an integer number (5888828).

Almost surely, 2^78480819 is an apocalyptic number.

78480819 is a deficient number, since it is larger than the sum of its proper divisors (39295741).

78480819 is a wasteful number, since it uses less digits than its factorization.

78480819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4472 (or 4463 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The square root of 78480819 is about 8858.9400607522. The cubic root of 78480819 is about 428.1420085878.

The spelling of 78480819 in words is "seventy-eight million, four hundred eighty thousand, eight hundred nineteen".