180145778 has 4 divisors (see below), whose sum is σ = 270218670. Its totient is φ = 90072888.

The previous prime is 180145769. The next prime is 180145793. The reversal of 180145778 is 877541081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 877541081 = 41 ⋅21403441.

It can be written as a sum of positive squares in only one way, i.e., 115713049 + 64432729 = 10757^2 + 8027^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45036443 + ... + 45036446.

Almost surely, 2^180145778 is an apocalyptic number.

180145778 is a deficient number, since it is larger than the sum of its proper divisors (90072892).

180145778 is an equidigital number, since it uses as much as digits as its factorization.

180145778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90072891.

The product of its (nonzero) digits is 62720, while the sum is 41.

The square root of 180145778 is about 13421.8395907566. The cubic root of 180145778 is about 564.7740010322.

The spelling of 180145778 in words is "one hundred eighty million, one hundred forty-five thousand, seven hundred seventy-eight".