78433640 has 32 divisors (see below), whose sum is σ = 179810280. Its totient is φ = 30780672.

The previous prime is 78433637. The next prime is 78433679. The reversal of 78433640 is 4633487.

It can be written as a sum of positive squares in 4 ways, for example, as 74891716 + 3541924 = 8654^2 + 1882^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 78433640.

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 7 ways as a sum of consecutive naturals, for example, 16379 + ... + 20618.

Almost surely, 2^78433640 is an apocalyptic number.

It is an amenable number.

78433640 is an abundant number, since it is smaller than the sum of its proper divisors (101376640).

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

78433640 is a wasteful number, since it uses less digits than its factorization.

78433640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37061 (or 37057 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 35.

The square root of 78433640 is about 8856.2768701074. The cubic root of 78433640 is about 428.0561984027.

The spelling of 78433640 in words is "seventy-eight million, four hundred thirty-three thousand, six hundred forty".