1641797460 has 36 divisors (see below), whose sum is σ = 4980119508. Its totient is φ = 437812608.

The previous prime is 1641797419. The next prime is 1641797461. The reversal of 1641797460 is 647971461.

1641797460 is a `hidden beast` number, since 16 + 4 + 179 + 7 + 460 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1008570564 + 633226896 = 31758^2 + 25164^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1641797461) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4560369 + ... + 4560728.

It is an arithmetic number, because the mean of its divisors is an integer number (138336653).

Almost surely, 2^1641797460 is an apocalyptic number.

1641797460 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1641797460 is an abundant number, since it is smaller than the sum of its proper divisors (3338322048).

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

1641797460 is a wasteful number, since it uses less digits than its factorization.

1641797460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9121112 (or 9121107 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The square root of 1641797460 is about 40519.0999406453. The cubic root of 1641797460 is about 1179.7043834790.

The spelling of 1641797460 in words is "one billion, six hundred forty-one million, seven hundred ninety-seven thousand, four hundred sixty".