145751778 has 32 divisors (see below), whose sum is σ = 342947520. Its totient is φ = 45725760.

The previous prime is 145751777. The next prime is 145751783. The reversal of 145751778 is 877157541.

145751778 is a `hidden beast` number, since 1 + 4 + 575 + 1 + 7 + 78 = 666.

It is a super-2 number, since 2×145751778² = 42487161580322568, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (145751773) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78468 + ... + 80303.

It is an arithmetic number, because the mean of its divisors is an integer number (10717110).

Almost surely, 2^145751778 is an apocalyptic number.

145751778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

145751778 is an abundant number, since it is smaller than the sum of its proper divisors (197195742).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

145751778 is a wasteful number, since it uses less digits than its factorization.

145751778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158799 (or 158793 counting only the distinct ones).

The product of its digits is 274400, while the sum is 45.

The square root of 145751778 is about 12072.7701046612. The cubic root of 145751778 is about 526.2651609724.

It can be divided in two parts, 1457 and 51778, that added together give a palindrome (53235).

The spelling of 145751778 in words is "one hundred forty-five million, seven hundred fifty-one thousand, seven hundred seventy-eight".