145504978 has 4 divisors (see below), whose sum is σ = 218257470. Its totient is φ = 72752488.

The previous prime is 145504963. The next prime is 145504999. The reversal of 145504978 is 879405541.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 143592289 + 1912689 = 11983^2 + 1383^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36376243 + ... + 36376246.

Almost surely, 2^145504978 is an apocalyptic number.

145504978 is a deficient number, since it is larger than the sum of its proper divisors (72752492).

145504978 is an equidigital number, since it uses as much as digits as its factorization.

145504978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72752491.

The product of its (nonzero) digits is 201600, while the sum is 43.

The square root of 145504978 is about 12062.5444247887. The cubic root of 145504978 is about 525.9679533455.

The spelling of 145504978 in words is "one hundred forty-five million, five hundred four thousand, nine hundred seventy-eight".