145690640 has 40 divisors (see below), whose sum is σ = 345131928. Its totient is φ = 57175040.

The previous prime is 145690639. The next prime is 145690661. The reversal of 145690640 is 46096541.

It can be written as a sum of positive squares in 4 ways, for example, as 47997184 + 97693456 = 6928^2 + 9884^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 145690640.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12941 + ... + 21420.

Almost surely, 2^145690640 is an apocalyptic number.

145690640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

145690640 is an abundant number, since it is smaller than the sum of its proper divisors (199441288).

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

145690640 is a wasteful number, since it uses less digits than its factorization.

145690640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34427 (or 34421 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 145690640 is about 12070.2377772768. The cubic root of 145690640 is about 526.1915671322.

The spelling of 145690640 in words is "one hundred forty-five million, six hundred ninety thousand, six hundred forty".