6406777440 has 864 divisors, whose sum is σ = 27427196160. Its totient is φ = 1354752000.

The previous prime is 6406777427. The next prime is 6406777441. The reversal of 6406777440 is 447776046.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6406777441) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 63433390 + ... + 63433490.

It is an arithmetic number, because the mean of its divisors is an integer number (31744440).

Almost surely, 2^6406777440 is an apocalyptic number.

6406777440 is a gapful number since it is divisible by the number (60) 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 6406777440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13713598080).

6406777440 is an abundant number, since it is smaller than the sum of its proper divisors (21020418720).

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

6406777440 is a wasteful number, since it uses less digits than its factorization.

6406777440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196 (or 178 counting only the distinct ones).

The product of its (nonzero) digits is 790272, while the sum is 45.

The square root of 6406777440 is about 80042.3477916534. The cubic root of 6406777440 is about 1857.2906791099.

The spelling of 6406777440 in words is "six billion, four hundred six million, seven hundred seventy-seven thousand, four hundred forty".