1865672640 has 168 divisors, whose sum is σ = 6910901088. Its totient is φ = 459233280.

The previous prime is 1865672639. The next prime is 1865672779. The reversal of 1865672640 is 462765681.

1865672640 is a `hidden beast` number, since 1 + 86 + 567 + 2 + 6 + 4 + 0 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12525 + ... + 62355.

It is an arithmetic number, because the mean of its divisors is an integer number (41136316).

Almost surely, 2^1865672640 is an apocalyptic number.

1865672640 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 1865672640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3455450544).

1865672640 is an abundant number, since it is smaller than the sum of its proper divisors (5045228448).

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

1865672640 is a wasteful number, since it uses less digits than its factorization.

1865672640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49867 (or 49854 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The square root of 1865672640 is about 43193.4328341705. The cubic root of 1865672640 is about 1231.0579040501.

The spelling of 1865672640 in words is "one billion, eight hundred sixty-five million, six hundred seventy-two thousand, six hundred forty".