145428257 has 8 divisors (see below), whose sum is σ = 158953536. Its totient is φ = 132237072.

The previous prime is 145428253. The next prime is 145428263. The reversal of 145428257 is 752824541.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 145428257 - 2² = 145428253 is a prime.

It is a super-2 number, since 2×145428257² = 42298755868116098, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 145428257.

It is not an unprimeable number, because it can be changed into a prime (145428253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82613 + ... + 84354.

It is an arithmetic number, because the mean of its divisors is an integer number (19869192).

Almost surely, 2^145428257 is an apocalyptic number.

It is an amenable number.

145428257 is a deficient number, since it is larger than the sum of its proper divisors (13525279).

145428257 is a wasteful number, since it uses less digits than its factorization.

145428257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167047.

The product of its digits is 89600, while the sum is 38.

The square root of 145428257 is about 12059.3638721120. The cubic root of 145428257 is about 525.8754940076.

The spelling of 145428257 in words is "one hundred forty-five million, four hundred twenty-eight thousand, two hundred fifty-seven".