78444630 has 192 divisors, whose sum is σ = 242611200. Its totient is φ = 17372160.

The previous prime is 78444629. The next prime is 78444631. The reversal of 78444630 is 3644487.

It is an interprime number because it is at equal distance from previous prime (78444629) and next prime (78444631).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78444631) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 992931 + ... + 993009.

It is an arithmetic number, because the mean of its divisors is an integer number (1263600).

Almost surely, 2^78444630 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78444630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121305600).

78444630 is an abundant number, since it is smaller than the sum of its proper divisors (164166570).

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

78444630 is a wasteful number, since it uses less digits than its factorization.

78444630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179 (or 176 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 36.

The square root of 78444630 is about 8856.8973122646. The cubic root of 78444630 is about 428.0761903259.

The spelling of 78444630 in words is "seventy-eight million, four hundred forty-four thousand, six hundred thirty".