78249460 has 24 divisors (see below), whose sum is σ = 164563560. Its totient is φ = 31254144.

The previous prime is 78249433. The next prime is 78249463. The reversal of 78249460 is 6494287.

It can be written as a sum of positive squares in 4 ways, for example, as 29724304 + 48525156 = 5452^2 + 6966^2 .

It is a super-2 number, since 2×78249460² = 12245955980583200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78249463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13486 + ... + 18394.

It is an arithmetic number, because the mean of its divisors is an integer number (6856815).

Almost surely, 2^78249460 is an apocalyptic number.

It is an amenable number.

78249460 is an abundant number, since it is smaller than the sum of its proper divisors (86314100).

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

78249460 is a wasteful number, since it uses less digits than its factorization.

78249460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5715 (or 5713 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 78249460 is about 8845.8724838198. The cubic root of 78249460 is about 427.7208780725.

The spelling of 78249460 in words is "seventy-eight million, two hundred forty-nine thousand, four hundred sixty".