1640471632 has 10 divisors (see below), whose sum is σ = 3178413818. Its totient is φ = 820235808.

The previous prime is 1640471621. The next prime is 1640471639. The reversal of 1640471632 is 2361740461.

It can be written as a sum of positive squares in only one way, i.e., 1576407616 + 64064016 = 39704^2 + 8004^2 .

It is a super-2 number, since 2×1640471632² = 5382294350793486848, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640471639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51264723 + ... + 51264754.

Almost surely, 2^1640471632 is an apocalyptic number.

It is an amenable number.

1640471632 is a deficient number, since it is larger than the sum of its proper divisors (1537942186).

1640471632 is a wasteful number, since it uses less digits than its factorization.

1640471632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102529485 (or 102529479 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 1640471632 is about 40502.7361051078. The cubic root of 1640471632 is about 1179.3867425287.

The spelling of 1640471632 in words is "one billion, six hundred forty million, four hundred seventy-one thousand, six hundred thirty-two".