645465774 has 16 divisors (see below), whose sum is σ = 1303466112. Its totient is φ = 213066168.

The previous prime is 645465761. The next prime is 645465791. The reversal of 645465774 is 477564546.

645465774 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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, 521604 + ... + 522839.

It is an arithmetic number, because the mean of its divisors is an integer number (81466632).

Almost surely, 2^645465774 is an apocalyptic number.

645465774 is an abundant number, since it is smaller than the sum of its proper divisors (658000338).

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

645465774 is a wasteful number, since it uses less digits than its factorization.

645465774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1044551.

The product of its digits is 2822400, while the sum is 48.

The square root of 645465774 is about 25406.0184601995. The cubic root of 645465774 is about 864.2201861872.

The spelling of 645465774 in words is "six hundred forty-five million, four hundred sixty-five thousand, seven hundred seventy-four".