78189750 has 192 divisors, whose sum is σ = 233625600. Its totient is φ = 18792000.

The previous prime is 78189743. The next prime is 78189751. The reversal of 78189750 is 5798187.

It is a super-2 number, since 2×78189750² = 12227274010125000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 78189696 and 78189705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78189751) 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, 1325221 + ... + 1325279.

It is an arithmetic number, because the mean of its divisors is an integer number (1216800).

Almost surely, 2^78189750 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78189750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116812800).

78189750 is an abundant number, since it is smaller than the sum of its proper divisors (155435850).

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

78189750 is a wasteful number, since it uses less digits than its factorization.

78189750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132 (or 119 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 45.

The square root of 78189750 is about 8842.4968193379. The cubic root of 78189750 is about 427.6120563952.

The spelling of 78189750 in words is "seventy-eight million, one hundred eighty-nine thousand, seven hundred fifty".