646876554 has 32 divisors (see below), whose sum is σ = 1395714240. Its totient is φ = 199110912.

The previous prime is 646876553. The next prime is 646876577. The reversal of 646876554 is 455678646.

It is a super-2 number, since 2×646876554² = 836898552229829832, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a junction number, because it is equal to n+sod(n) for n = 646876497 and 646876506.

It is not an unprimeable number, because it can be changed into a prime (646876553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54424 + ... + 65235.

It is an arithmetic number, because the mean of its divisors is an integer number (43616070).

Almost surely, 2^646876554 is an apocalyptic number.

646876554 is an abundant number, since it is smaller than the sum of its proper divisors (748837686).

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

646876554 is a wasteful number, since it uses less digits than its factorization.

646876554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119734.

The product of its digits is 4838400, while the sum is 51.

The square root of 646876554 is about 25433.7679866747. The cubic root of 646876554 is about 864.8493635468.

The spelling of 646876554 in words is "six hundred forty-six million, eight hundred seventy-six thousand, five hundred fifty-four".