78681450 has 48 divisors (see below), whose sum is σ = 198067680. Its totient is φ = 20665920.

The previous prime is 78681433. The next prime is 78681461. The reversal of 78681450 is 5418687.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 78681399 and 78681408.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6136 + ... + 13964.

It is an arithmetic number, because the mean of its divisors is an integer number (4126410).

Almost surely, 2^78681450 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78681450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99033840).

78681450 is an abundant number, since it is smaller than the sum of its proper divisors (119386230).

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

78681450 is a wasteful number, since it uses less digits than its factorization.

78681450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7911 (or 7906 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 39.

The square root of 78681450 is about 8870.2564788173. The cubic root of 78681450 is about 428.5065370004.

It can be divided in two parts, 78 and 681450, that added together give a triangular number (681528 = T₁₁₆₇).

The spelling of 78681450 in words is "seventy-eight million, six hundred eighty-one thousand, four hundred fifty".