145172784 has 20 divisors (see below), whose sum is σ = 375029816. Its totient is φ = 48390912.

The previous prime is 145172767. The next prime is 145172789. The reversal of 145172784 is 487271541.

It is not an unprimeable number, because it can be changed into a prime (145172789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1512169 + ... + 1512264.

Almost surely, 2^145172784 is an apocalyptic number.

It is an amenable number.

145172784 is an abundant number, since it is smaller than the sum of its proper divisors (229857032).

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

145172784 is a wasteful number, since it uses less digits than its factorization.

145172784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3024444 (or 3024438 counting only the distinct ones).

The product of its digits is 62720, while the sum is 39.

The square root of 145172784 is about 12048.7669078624. The cubic root of 145172784 is about 525.5673793432.

The spelling of 145172784 in words is "one hundred forty-five million, one hundred seventy-two thousand, seven hundred eighty-four".