220278406 has 8 divisors (see below), whose sum is σ = 344783664. Its totient is φ = 105350520.

The previous prime is 220278397. The next prime is 220278481. The reversal of 220278406 is 604872022.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×220278406² = 97045152299801672, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2394285 + ... + 2394376.

It is an arithmetic number, because the mean of its divisors is an integer number (43097958).

Almost surely, 2^220278406 is an apocalyptic number.

220278406 is a deficient number, since it is larger than the sum of its proper divisors (124505258).

220278406 is a wasteful number, since it uses less digits than its factorization.

220278406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4788686.

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 220278406 is about 14841.7790712569. The cubic root of 220278406 is about 603.9356154782.

It can be divided in two parts, 2202 and 78406, that added together give a palindrome (80608).

The spelling of 220278406 in words is "two hundred twenty million, two hundred seventy-eight thousand, four hundred six".