145640687 has 8 divisors (see below), whose sum is σ = 148952640. Its totient is φ = 142365600.

The previous prime is 145640617. The next prime is 145640689. The reversal of 145640687 is 786046541.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145640687 is a prime.

It is a super-2 number, since 2×145640687² = 42422419419663938, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145640689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1148 + ... + 17105.

It is an arithmetic number, because the mean of its divisors is an integer number (18619080).

Almost surely, 2^145640687 is an apocalyptic number.

145640687 is a deficient number, since it is larger than the sum of its proper divisors (3311953).

145640687 is a wasteful number, since it uses less digits than its factorization.

145640687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18433.

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

The square root of 145640687 is about 12068.1683365787. The cubic root of 145640687 is about 526.1314217629.

The spelling of 145640687 in words is "one hundred forty-five million, six hundred forty thousand, six hundred eighty-seven".