1642764440 has 32 divisors (see below), whose sum is σ = 3697937280. Its totient is φ = 656800512.

The previous prime is 1642764437. The next prime is 1642764457. The reversal of 1642764440 is 444672461.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1642764394 and 1642764403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90617 + ... + 107223.

It is an arithmetic number, because the mean of its divisors is an integer number (115560540).

Almost surely, 2^1642764440 is an apocalyptic number.

1642764440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1642764440 is an abundant number, since it is smaller than the sum of its proper divisors (2055172840).

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

1642764440 is a wasteful number, since it uses less digits than its factorization.

1642764440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19091 (or 19087 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 38.

The square root of 1642764440 is about 40531.0305815186. The cubic root of 1642764440 is about 1179.9359440475.

The spelling of 1642764440 in words is "one billion, six hundred forty-two million, seven hundred sixty-four thousand, four hundred forty".