78289390 has 8 divisors (see below), whose sum is σ = 140920920. Its totient is φ = 31315752.

The previous prime is 78289333. The next prime is 78289391. The reversal of 78289390 is 9398287.

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

It is a super-2 number, since 2×78289390² = 12258457173144200, 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 78289390.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78289391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3914460 + ... + 3914479.

It is an arithmetic number, because the mean of its divisors is an integer number (17615115).

Almost surely, 2^78289390 is an apocalyptic number.

78289390 is a deficient number, since it is larger than the sum of its proper divisors (62631530).

78289390 is a wasteful number, since it uses less digits than its factorization.

78289390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7828946.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 78289390 is about 8848.1291807930. The cubic root of 78289390 is about 427.7936197478.

The spelling of 78289390 in words is "seventy-eight million, two hundred eighty-nine thousand, three hundred ninety".