145330778 has 4 divisors (see below), whose sum is σ = 217996170. Its totient is φ = 72665388.

The previous prime is 145330777. The next prime is 145330781. The reversal of 145330778 is 877033541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 877033541 = 8999 ⋅97459.

It can be written as a sum of positive squares in only one way, i.e., 106853569 + 38477209 = 10337^2 + 6203^2 .

It is a super-2 number, since 2×145330778² = 42242070068170568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (145330771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36332693 + ... + 36332696.

Almost surely, 2^145330778 is an apocalyptic number.

145330778 is a deficient number, since it is larger than the sum of its proper divisors (72665392).

145330778 is an equidigital number, since it uses as much as digits as its factorization.

145330778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72665391.

The product of its (nonzero) digits is 70560, while the sum is 38.

The square root of 145330778 is about 12055.3215635254. The cubic root of 145330778 is about 525.7579715123.

The spelling of 145330778 in words is "one hundred forty-five million, three hundred thirty thousand, seven hundred seventy-eight".