1640764472 has 8 divisors (see below), whose sum is σ = 3076433400. Its totient is φ = 820382232.

The previous prime is 1640764439. The next prime is 1640764483. The reversal of 1640764472 is 2744670461.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102547772 + ... + 102547787.

It is an arithmetic number, because the mean of its divisors is an integer number (384554175).

Almost surely, 2^1640764472 is an apocalyptic number.

It is an amenable number.

1640764472 is a deficient number, since it is larger than the sum of its proper divisors (1435668928).

1640764472 is a wasteful number, since it uses less digits than its factorization.

1640764472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205095565 (or 205095561 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 41.

The square root of 1640764472 is about 40506.3510082061. The cubic root of 1640764472 is about 1179.4569156541.

The spelling of 1640764472 in words is "one billion, six hundred forty million, seven hundred sixty-four thousand, four hundred seventy-two".