78270639 has 8 divisors (see below), whose sum is σ = 106129920. Its totient is φ = 51295896.

The previous prime is 78270637. The next prime is 78270649. The reversal of 78270639 is 93607287.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78270639 - 2¹ = 78270637 is a prime.

It is a super-2 number, since 2×78270639² = 12252585858936642, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78270639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78270631) by changing a digit.

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, 220927 + ... + 221280.

It is an arithmetic number, because the mean of its divisors is an integer number (13266240).

Almost surely, 2^78270639 is an apocalyptic number.

78270639 is a deficient number, since it is larger than the sum of its proper divisors (27859281).

78270639 is a wasteful number, since it uses less digits than its factorization.

78270639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442269.

The product of its (nonzero) digits is 127008, while the sum is 42.

The square root of 78270639 is about 8847.0695148168. The cubic root of 78270639 is about 427.7594635713.

The spelling of 78270639 in words is "seventy-eight million, two hundred seventy thousand, six hundred thirty-nine".