145423778 has 4 divisors (see below), whose sum is σ = 218135670. Its totient is φ = 72711888.

The previous prime is 145423769. The next prime is 145423783. The reversal of 145423778 is 877324541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 877324541 = 109 ⋅8048849.

It can be written as a sum of positive squares in only one way, i.e., 131859289 + 13564489 = 11483^2 + 3683^2 .

It is a super-2 number, since 2×145423778² = 42296150415586568, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36355943 + ... + 36355946.

Almost surely, 2^145423778 is an apocalyptic number.

145423778 is a deficient number, since it is larger than the sum of its proper divisors (72711892).

145423778 is an equidigital number, since it uses as much as digits as its factorization.

145423778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72711891.

The product of its digits is 188160, while the sum is 41.

The square root of 145423778 is about 12059.1781643692. The cubic root of 145423778 is about 525.8700951932.

The spelling of 145423778 in words is "one hundred forty-five million, four hundred twenty-three thousand, seven hundred seventy-eight".