61806144 has 56 divisors (see below), whose sum is σ = 164112448. Its totient is φ = 20528640.

The previous prime is 61806133. The next prime is 61806167. The reversal of 61806144 is 44160816.

It is a super-2 number, since 2×61806144² = 7639998872297472, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93174 + ... + 93834.

Almost surely, 2^61806144 is an apocalyptic number.

61806144 is a gapful number since it is divisible by the number (64) 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 61806144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82056224).

61806144 is an abundant number, since it is smaller than the sum of its proper divisors (102306304).

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

61806144 is a wasteful number, since it uses less digits than its factorization.

61806144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1163 (or 1153 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 61806144 is about 7861.6883682832. The cubic root of 61806144 is about 395.3762243576.

The spelling of 61806144 in words is "sixty-one million, eight hundred six thousand, one hundred forty-four".