6402021654 has 64 divisors (see below), whose sum is σ = 14871384576. Its totient is φ = 1799449344.

The previous prime is 6402021623. The next prime is 6402021673. The reversal of 6402021654 is 4561202046.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3862794 + ... + 3864450.

It is an arithmetic number, because the mean of its divisors is an integer number (232365384).

Almost surely, 2^6402021654 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6402021654, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7435692288).

6402021654 is an abundant number, since it is smaller than the sum of its proper divisors (8469362922).

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

6402021654 is a wasteful number, since it uses less digits than its factorization.

6402021654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3109.

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 6402021654 is about 80012.6343398341. The cubic root of 6402021654 is about 1856.8310063358.

It can be divided in two parts, 64020216 and 54, that added together give a triangular number (64020270 = T₁₁₃₁₅).

The spelling of 6402021654 in words is "six billion, four hundred two million, twenty-one thousand, six hundred fifty-four".