145946578 has 4 divisors (see below), whose sum is σ = 218919870. Its totient is φ = 72973288.

The previous prime is 145946551. The next prime is 145946597. The reversal of 145946578 is 875649541.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 875649541 = 13 ⋅67357657.

It can be written as a sum of positive squares in only one way, i.e., 104305369 + 41641209 = 10213^2 + 6453^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36486643 + ... + 36486646.

Almost surely, 2^145946578 is an apocalyptic number.

145946578 is a deficient number, since it is larger than the sum of its proper divisors (72973292).

145946578 is an equidigital number, since it uses as much as digits as its factorization.

145946578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72973291.

The product of its digits is 1209600, while the sum is 49.

The square root of 145946578 is about 12080.8351532500. The cubic root of 145946578 is about 526.4995110365.

The spelling of 145946578 in words is "one hundred forty-five million, nine hundred forty-six thousand, five hundred seventy-eight".