78280049 has 4 divisors (see below), whose sum is σ = 80395764. Its totient is φ = 76164336.

The previous prime is 78280031. The next prime is 78280091. The reversal of 78280049 is 94008287.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94008287 = 257 ⋅365791.

It can be written as a sum of positive squares in 2 ways, for example, as 66308449 + 11971600 = 8143^2 + 3460^2 .

It is a cyclic number.

It is not a de Polignac number, because 78280049 - 2⁸ = 78279793 is a prime.

It is a super-2 number, since 2×78280049² = 12255532142884802, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78279994 and 78280021.

It is not an unprimeable number, because it can be changed into a prime (78280009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1057802 + ... + 1057875.

It is an arithmetic number, because the mean of its divisors is an integer number (20098941).

Almost surely, 2^78280049 is an apocalyptic number.

It is an amenable number.

78280049 is a deficient number, since it is larger than the sum of its proper divisors (2115715).

78280049 is a wasteful number, since it uses less digits than its factorization.

78280049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2115714.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 78280049 is about 8847.6013133504. The cubic root of 78280049 is about 427.7766051853.

The spelling of 78280049 in words is "seventy-eight million, two hundred eighty thousand, forty-nine".