78287545 has 12 divisors (see below), whose sum is σ = 109283364. Its totient is φ = 53682720.

The previous prime is 78287537. The next prime is 78287621. The reversal of 78287545 is 54578287.

It can be written as a sum of positive squares in 2 ways, for example, as 28005264 + 50282281 = 5292^2 + 7091^2 .

It is not a de Polignac number, because 78287545 - 2³ = 78287537 is a prime.

It is a super-2 number, since 2×78287545² = 12257879404254050, 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 = 78287495 and 78287504.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 159526 + ... + 160015.

It is an arithmetic number, because the mean of its divisors is an integer number (9106947).

Almost surely, 2^78287545 is an apocalyptic number.

It is an amenable number.

78287545 is a deficient number, since it is larger than the sum of its proper divisors (30995819).

78287545 is a wasteful number, since it uses less digits than its factorization.

78287545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319560 (or 319553 counting only the distinct ones).

The product of its digits is 627200, while the sum is 46.

The square root of 78287545 is about 8848.0249208510. The cubic root of 78287545 is about 427.7902592012.

The spelling of 78287545 in words is "seventy-eight million, two hundred eighty-seven thousand, five hundred forty-five".