145220615 has 16 divisors (see below), whose sum is σ = 176234400. Its totient is φ = 114871680.

The previous prime is 145220587. The next prime is 145220617. The reversal of 145220615 is 516022541.

It is not a de Polignac number, because 145220615 - 2²² = 141026311 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145220617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 295520 + ... + 296010.

It is an arithmetic number, because the mean of its divisors is an integer number (11014650).

Almost surely, 2^145220615 is an apocalyptic number.

145220615 is a deficient number, since it is larger than the sum of its proper divisors (31013785).

145220615 is a wasteful number, since it uses less digits than its factorization.

145220615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1042.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 145220615 is about 12050.7516363088. The cubic root of 145220615 is about 525.6250936803.

The spelling of 145220615 in words is "one hundred forty-five million, two hundred twenty thousand, six hundred fifteen".