1640213470 has 64 divisors (see below), whose sum is σ = 3423720960. Its totient is φ = 554159232.

The previous prime is 1640213453. The next prime is 1640213479. The reversal of 1640213470 is 743120461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640213479) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1731537 + ... + 1732483.

It is an arithmetic number, because the mean of its divisors is an integer number (53495640).

Almost surely, 2^1640213470 is an apocalyptic number.

1640213470 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1640213470 is an abundant number, since it is smaller than the sum of its proper divisors (1783507490).

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

1640213470 is a wasteful number, since it uses less digits than its factorization.

1640213470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1297.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 1640213470 is about 40499.5490098347. The cubic root of 1640213470 is about 1179.3248723511.

The spelling of 1640213470 in words is "one billion, six hundred forty million, two hundred thirteen thousand, four hundred seventy".