78385998 has 8 divisors (see below), whose sum is σ = 156772008. Its totient is φ = 26128664.

The previous prime is 78385981. The next prime is 78386071. The reversal of 78385998 is 89958387.

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

78385998 is an admirable number.

It is a super-2 number, since 2×78385998² = 12288729364912008, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6532161 + ... + 6532172.

It is an arithmetic number, because the mean of its divisors is an integer number (19596501).

Almost surely, 2^78385998 is an apocalyptic number.

78385998 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

78385998 is a wasteful number, since it uses less digits than its factorization.

78385998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13064338.

The product of its digits is 4354560, while the sum is 57.

The square root of 78385998 is about 8853.5867308114. The cubic root of 78385998 is about 427.9695111772.

The spelling of 78385998 in words is "seventy-eight million, three hundred eighty-five thousand, nine hundred ninety-eight".