1642723440 has 80 divisors (see below), whose sum is σ = 5112449568. Its totient is φ = 436338688.

The previous prime is 1642723429. The next prime is 1642723501. The reversal of 1642723440 is 443272461.

1642723440 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48364 + ... + 74996.

Almost surely, 2^1642723440 is an apocalyptic number.

1642723440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1642723440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2556224784).

1642723440 is an abundant number, since it is smaller than the sum of its proper divisors (3469726128).

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

1642723440 is a wasteful number, since it uses less digits than its factorization.

1642723440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26906 (or 26900 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 33.

The square root of 1642723440 is about 40530.5247930495. The cubic root of 1642723440 is about 1179.9261277129.

The spelling of 1642723440 in words is "one billion, six hundred forty-two million, seven hundred twenty-three thousand, four hundred forty".