1864271640 has 768 divisors, whose sum is σ = 7859980800. Its totient is φ = 348364800.

The previous prime is 1864271609. The next prime is 1864271653. The reversal of 1864271640 is 461724681.

1864271640 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 45470020 + ... + 45470060.

It is an arithmetic number, because the mean of its divisors is an integer number (10234350).

Almost surely, 2^1864271640 is an apocalyptic number.

1864271640 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 1864271640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3929990400).

1864271640 is an abundant number, since it is smaller than the sum of its proper divisors (5995709160).

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

1864271640 is a wasteful number, since it uses less digits than its factorization.

1864271640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136 (or 125 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 39.

The square root of 1864271640 is about 43177.2120452444. The cubic root of 1864271640 is about 1230.7496784835.

The spelling of 1864271640 in words is "one billion, eight hundred sixty-four million, two hundred seventy-one thousand, six hundred forty".