145890690 has 64 divisors (see below), whose sum is σ = 383225472. Its totient is φ = 35251200.

The previous prime is 145890673. The next prime is 145890697. The reversal of 145890690 is 96098541.

It is a super-2 number, since 2×145890690² = 42568186857352200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (145890697) 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 31 ways as a sum of consecutive naturals, for example, 142380 + ... + 143400.

It is an arithmetic number, because the mean of its divisors is an integer number (5987898).

Almost surely, 2^145890690 is an apocalyptic number.

145890690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 145890690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (191612736).

145890690 is an abundant number, since it is smaller than the sum of its proper divisors (237334782).

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

145890690 is a wasteful number, since it uses less digits than its factorization.

145890690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1475.

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 145890690 is about 12078.5218466499. The cubic root of 145890690 is about 526.4322974897.

The spelling of 145890690 in words is "one hundred forty-five million, eight hundred ninety thousand, six hundred ninety".