645740454 has 16 divisors (see below), whose sum is σ = 1291732992. Its totient is φ = 215204808.

The previous prime is 645740453. The next prime is 645740483. The reversal of 645740454 is 454047546.

It is a super-2 number, since 2×645740454² = 833961467864252232, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645740453) 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, 47107 + ... + 59249.

It is an arithmetic number, because the mean of its divisors is an integer number (80733312).

Almost surely, 2^645740454 is an apocalyptic number.

645740454 is an abundant number, since it is smaller than the sum of its proper divisors (645992538).

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

645740454 is a wasteful number, since it uses less digits than its factorization.

645740454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21011.

The product of its (nonzero) digits is 268800, while the sum is 39.

The square root of 645740454 is about 25411.4236909308. The cubic root of 645740454 is about 864.3427593456.

The spelling of 645740454 in words is "six hundred forty-five million, seven hundred forty thousand, four hundred fifty-four".