78306998 has 48 divisors (see below), whose sum is σ = 157864464. Its totient is φ = 28707840.

The previous prime is 78306997. The next prime is 78307013. The reversal of 78306998 is 89960387.

It is a super-2 number, since 2×78306998² = 12263971871544008, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78306997) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16190 + ... + 20462.

It is an arithmetic number, because the mean of its divisors is an integer number (3288843).

Almost surely, 2^78306998 is an apocalyptic number.

78306998 is an abundant number, since it is smaller than the sum of its proper divisors (79557466).

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

78306998 is a wasteful number, since it uses less digits than its factorization.

78306998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4317 (or 4310 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 50.

The square root of 78306998 is about 8849.1241374500. The cubic root of 78306998 is about 427.8256889098.

The spelling of 78306998 in words is "seventy-eight million, three hundred six thousand, nine hundred ninety-eight".