1640472344 has 32 divisors (see below), whose sum is σ = 3574886400. Its totient is φ = 691141920.

The previous prime is 1640472343. The next prime is 1640472347. The reversal of 1640472344 is 4432740461.

It is a super-2 number, since 2×1640472344² = 5382299022857708672, which contains 22 as substring.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640472343) 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, 244952 + ... + 251559.

It is an arithmetic number, because the mean of its divisors is an integer number (111715200).

Almost surely, 2^1640472344 is an apocalyptic number.

1640472344 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1640472344 is an abundant number, since it is smaller than the sum of its proper divisors (1934414056).

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

1640472344 is a wasteful number, since it uses less digits than its factorization.

1640472344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496583 (or 496579 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 35.

The square root of 1640472344 is about 40502.7448946365. The cubic root of 1640472344 is about 1179.3869131550.

The spelling of 1640472344 in words is "one billion, six hundred forty million, four hundred seventy-two thousand, three hundred forty-four".