856451616 has 24 divisors (see below), whose sum is σ = 2248185744. Its totient is φ = 285483840.

The previous prime is 856451587. The next prime is 856451627. The reversal of 856451616 is 616154658.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×856451616² = 1467018741098022912, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4460590 + ... + 4460781.

It is an arithmetic number, because the mean of its divisors is an integer number (93674406).

Almost surely, 2^856451616 is an apocalyptic number.

It is an amenable number.

856451616 is an abundant number, since it is smaller than the sum of its proper divisors (1391734128).

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

856451616 is a wasteful number, since it uses less digits than its factorization.

856451616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8921384 (or 8921376 counting only the distinct ones).

The product of its digits is 172800, while the sum is 42.

The square root of 856451616 is about 29265.1946174974. The cubic root of 856451616 is about 949.6588307700.

The spelling of 856451616 in words is "eight hundred fifty-six million, four hundred fifty-one thousand, six hundred sixteen".