164214778 has 48 divisors (see below), whose sum is σ = 310923144. Its totient is φ = 64471680.

The previous prime is 164214709. The next prime is 164214793. The reversal of 164214778 is 877412461.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 77668969 + 86545809 = 8813^2 + 9303^2 .

164214778 is a modest number, since divided by 14778 gives 1642 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 164214778.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 199608 + ... + 200428.

Almost surely, 2^164214778 is an apocalyptic number.

164214778 is a deficient number, since it is larger than the sum of its proper divisors (146708366).

164214778 is a wasteful number, since it uses less digits than its factorization.

164214778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1007 (or 1000 counting only the distinct ones).

The product of its digits is 75264, while the sum is 40.

The square root of 164214778 is about 12814.6314032047. The cubic root of 164214778 is about 547.6092126608.

It can be divided in two parts, 1642 and 14778, that multiplied together give a square (24265476 = 4926²).

The spelling of 164214778 in words is "one hundred sixty-four million, two hundred fourteen thousand, seven hundred seventy-eight".