78144402 has 16 divisors (see below), whose sum is σ = 178615872. Its totient is φ = 22326960.

The previous prime is 78144361. The next prime is 78144413. The reversal of 78144402 is 20444187.

It is a super-2 number, since 2×78144402² = 12213095127875208, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78144402.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 930249 + ... + 930332.

It is an arithmetic number, because the mean of its divisors is an integer number (11163492).

Almost surely, 2^78144402 is an apocalyptic number.

78144402 is an abundant number, since it is smaller than the sum of its proper divisors (100471470).

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

78144402 is a wasteful number, since it uses less digits than its factorization.

78144402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1860593.

The product of its (nonzero) digits is 7168, while the sum is 30.

The square root of 78144402 is about 8839.9322395593. The cubic root of 78144402 is about 427.5293724902.

Adding to 78144402 its reverse (20444187), we get a palindrome (98588589).

The spelling of 78144402 in words is "seventy-eight million, one hundred forty-four thousand, four hundred two".