145540690 has 8 divisors (see below), whose sum is σ = 261973260. Its totient is φ = 58216272.

The previous prime is 145540687. The next prime is 145540739. The reversal of 145540690 is 96045541.

145540690 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 137194369 + 8346321 = 11713^2 + 2889^2 .

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

It is a super-4 number, since 4×145540690⁴ (a number of 34 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7277025 + ... + 7277044.

Almost surely, 2^145540690 is an apocalyptic number.

145540690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

145540690 is a deficient number, since it is larger than the sum of its proper divisors (116432570).

145540690 is a wasteful number, since it uses less digits than its factorization.

145540690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14554076.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 145540690 is about 12064.0246186751. The cubic root of 145540690 is about 526.0109801233.

The spelling of 145540690 in words is "one hundred forty-five million, five hundred forty thousand, six hundred ninety".