78224478 has 16 divisors (see below), whose sum is σ = 156537360. Its totient is φ = 26060096.

The previous prime is 78224477. The next prime is 78224519. The reversal of 78224478 is 87442287.

It is a super-2 number, since 2×78224478² = 12238137916744968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78224477) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15538 + ... + 19946.

It is an arithmetic number, because the mean of its divisors is an integer number (9783585).

Almost surely, 2^78224478 is an apocalyptic number.

78224478 is an abundant number, since it is smaller than the sum of its proper divisors (78312882).

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

78224478 is a wasteful number, since it uses less digits than its factorization.

78224478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7371.

The product of its digits is 200704, while the sum is 42.

The square root of 78224478 is about 8844.4603000975. The cubic root of 78224478 is about 427.6753550308.

The spelling of 78224478 in words is "seventy-eight million, two hundred twenty-four thousand, four hundred seventy-eight".