78380442 has 24 divisors (see below), whose sum is σ = 194085216. Its totient is φ = 22394376.

The previous prime is 78380429. The next prime is 78380447. The reversal of 78380442 is 24408387.

It is a super-2 number, since 2×78380442² = 12286987376230728, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78380397 and 78380406.

It is not an unprimeable number, because it can be changed into a prime (78380447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 310908 + ... + 311159.

It is an arithmetic number, because the mean of its divisors is an integer number (8086884).

Almost surely, 2^78380442 is an apocalyptic number.

78380442 is an abundant number, since it is smaller than the sum of its proper divisors (115704774).

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

78380442 is a wasteful number, since it uses less digits than its factorization.

78380442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622082 (or 622079 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 36.

The square root of 78380442 is about 8853.2729541114. The cubic root of 78380442 is about 427.9593994445.

It can be divided in two parts, 783 and 80442, that added together give a square (81225 = 285²).

The spelling of 78380442 in words is "seventy-eight million, three hundred eighty thousand, four hundred forty-two".