145778505 has 16 divisors (see below), whose sum is σ = 241289280. Its totient is φ = 75067328.

The previous prime is 145778491. The next prime is 145778513. The reversal of 145778505 is 505877541.

It is a cyclic number.

It is not a de Polignac number, because 145778505 - 2⁶ = 145778441 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 167127 + ... + 167996.

It is an arithmetic number, because the mean of its divisors is an integer number (15080580).

Almost surely, 2^145778505 is an apocalyptic number.

145778505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

145778505 is a deficient number, since it is larger than the sum of its proper divisors (95510775).

145778505 is a wasteful number, since it uses less digits than its factorization.

145778505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335160.

The product of its (nonzero) digits is 196000, while the sum is 42.

The square root of 145778505 is about 12073.8769664098. The cubic root of 145778505 is about 526.2973266848.

The spelling of 145778505 in words is "one hundred forty-five million, seven hundred seventy-eight thousand, five hundred five".