78293450 has 12 divisors (see below), whose sum is σ = 145625910. Its totient is φ = 31317360.

The previous prime is 78293447. The next prime is 78293461. The reversal of 78293450 is 5439287.

It can be written as a sum of positive squares in 3 ways, for example, as 63091249 + 15202201 = 7943^2 + 3899^2 .

It is a super-2 number, since 2×78293450² = 12259728625805000, which contains 22 as substring.

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 5 ways as a sum of consecutive naturals, for example, 782885 + ... + 782984.

Almost surely, 2^78293450 is an apocalyptic number.

78293450 is a deficient number, since it is larger than the sum of its proper divisors (67332460).

78293450 is a wasteful number, since it uses less digits than its factorization.

78293450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1565881 (or 1565876 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 78293450 is about 8848.3586048487. The cubic root of 78293450 is about 427.8010145858.

The spelling of 78293450 in words is "seventy-eight million, two hundred ninety-three thousand, four hundred fifty".