6455538738 has 48 divisors (see below), whose sum is σ = 15313761216. Its totient is φ = 1949145120.

The previous prime is 6455538737. The next prime is 6455538763. The reversal of 6455538738 is 8378355546.

6455538738 is a `hidden beast` number, since 6 + 4 + 5 + 553 + 87 + 3 + 8 = 666.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6455538737) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4006 + ... + 113697.

It is an arithmetic number, because the mean of its divisors is an integer number (319036692).

Almost surely, 2^6455538738 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6455538738, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7656880608).

6455538738 is an abundant number, since it is smaller than the sum of its proper divisors (8858222478).

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

6455538738 is a wasteful number, since it uses less digits than its factorization.

6455538738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117999 (or 117996 counting only the distinct ones).

The product of its digits is 12096000, while the sum is 54.

The square root of 6455538738 is about 80346.3672980926. The cubic root of 6455538738 is about 1861.9906557779.

The spelling of 6455538738 in words is "six billion, four hundred fifty-five million, five hundred thirty-eight thousand, seven hundred thirty-eight".