3551616 has 48 divisors (see below), whose sum is σ = 10223460. Its totient is φ = 1183488.

The previous prime is 3551599. The next prime is 3551621. The reversal of 3551616 is 6161553.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×3551616² = 25227952422912, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3551616.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 390 + ... + 2693.

Almost surely, 2^3551616 is an apocalyptic number.

3551616 is a gapful number since it is divisible by the number (36) 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 3551616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5111730).

3551616 is an abundant number, since it is smaller than the sum of its proper divisors (6671844).

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

3551616 is a wasteful number, since it uses less digits than its factorization.

3551616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3103 (or 3088 counting only the distinct ones).

The product of its digits is 2700, while the sum is 27.

The square root of 3551616 is about 1884.5731612225. The cubic root of 3551616 is about 152.5721740244.

The spelling of 3551616 in words is "three million, five hundred fifty-one thousand, six hundred sixteen".