645087406 has 8 divisors (see below), whose sum is σ = 1024550640. Its totient is φ = 303570528.

The previous prime is 645087367. The next prime is 645087413. The reversal of 645087406 is 604780546.

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

It is a super-2 number, since 2×645087406² = 832275522759617672, which contains 22 as substring.

It is a congruent number.

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, 9486546 + ... + 9486613.

It is an arithmetic number, because the mean of its divisors is an integer number (128068830).

Almost surely, 2^645087406 is an apocalyptic number.

645087406 is a deficient number, since it is larger than the sum of its proper divisors (379463234).

645087406 is a wasteful number, since it uses less digits than its factorization.

645087406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18973178.

The product of its (nonzero) digits is 161280, while the sum is 40.

The square root of 645087406 is about 25398.5709440512. The cubic root of 645087406 is about 864.0512863575.

The spelling of 645087406 in words is "six hundred forty-five million, eighty-seven thousand, four hundred six".