6451616 has 24 divisors (see below), whose sum is σ = 13047300. Its totient is φ = 3138048.

The previous prime is 6451609. The next prime is 6451633. The reversal of 6451616 is 6161546.

It can be written as a sum of positive squares in 2 ways, for example, as 6451600 + 16 = 2540^2 + 4^2 .

It is a super-2 number, since 2×6451616² = 83246698022912, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1541 + ... + 3908.

Almost surely, 2^6451616 is an apocalyptic number.

It is an amenable number.

6451616 is an abundant number, since it is smaller than the sum of its proper divisors (6595684).

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

6451616 is a wasteful number, since it uses less digits than its factorization.

6451616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5496 (or 5488 counting only the distinct ones).

The product of its digits is 4320, while the sum is 29.

The square root of 6451616 is about 2540.0031496043. The cubic root of 6451616 is about 186.1613430279.

It can be divided in two parts, 64516 and 16, that multiplied together give a square (1032256 = 1016²).

The spelling of 6451616 in words is "six million, four hundred fifty-one thousand, six hundred sixteen".