654817638 has 16 divisors (see below), whose sum is σ = 1345031280. Its totient is φ = 212373216.

The previous prime is 654817633. The next prime is 654817693. The reversal of 654817638 is 836718456.

It is a super-2 number, since 2×654817638² = 857572278071798088, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (654817633) 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, 1474593 + ... + 1475036.

It is an arithmetic number, because the mean of its divisors is an integer number (84064455).

Almost surely, 2^654817638 is an apocalyptic number.

654817638 is an abundant number, since it is smaller than the sum of its proper divisors (690213642).

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

654817638 is a wasteful number, since it uses less digits than its factorization.

654817638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2949671.

The product of its digits is 967680, while the sum is 48.

The square root of 654817638 is about 25589.4047996432. The cubic root of 654817638 is about 868.3739557879.

The spelling of 654817638 in words is "six hundred fifty-four million, eight hundred seventeen thousand, six hundred thirty-eight".