145687640 has 32 divisors (see below), whose sum is σ = 374626080. Its totient is φ = 49949952.

The previous prime is 145687621. The next prime is 145687643. The reversal of 145687640 is 46786541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145687643) 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 7 ways as a sum of consecutive naturals, for example, 259877 + ... + 260436.

It is an arithmetic number, because the mean of its divisors is an integer number (11707065).

Almost surely, 2^145687640 is an apocalyptic number.

145687640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

145687640 is an abundant number, since it is smaller than the sum of its proper divisors (228938440).

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

145687640 is a wasteful number, since it uses less digits than its factorization.

145687640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520331 (or 520327 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 41.

The square root of 145687640 is about 12070.1135040231. The cubic root of 145687640 is about 526.1879554027.

The spelling of 145687640 in words is "one hundred forty-five million, six hundred eighty-seven thousand, six hundred forty".