78429450 has 48 divisors (see below), whose sum is σ = 212191776. Its totient is φ = 19012800.

The previous prime is 78429437. The next prime is 78429451. The reversal of 78429450 is 5492487.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 78429399 and 78429408.

It is not an unprimeable number, because it can be changed into a prime (78429451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22117 + ... + 25416.

It is an arithmetic number, because the mean of its divisors is an integer number (4420662).

Almost surely, 2^78429450 is an apocalyptic number.

78429450 is an abundant number, since it is smaller than the sum of its proper divisors (133762326).

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

78429450 is a wasteful number, since it uses less digits than its factorization.

78429450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47559 (or 47554 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 78429450 is about 8856.0403115614. The cubic root of 78429450 is about 428.0485758766.

The spelling of 78429450 in words is "seventy-eight million, four hundred twenty-nine thousand, four hundred fifty".