61855816 has 32 divisors (see below), whose sum is σ = 127008000. Its totient is φ = 28008640.

The previous prime is 61855813. The next prime is 61855817.

61855816 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×61855816² = 7652283946051712, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61855813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24585 + ... + 26983.

It is an arithmetic number, because the mean of its divisors is an integer number (3969000).

Almost surely, 2^61855816 is an apocalyptic number.

It is an amenable number.

61855816 is an abundant number, since it is smaller than the sum of its proper divisors (65152184).

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

61855816 is a wasteful number, since it uses less digits than its factorization.

61855816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2709 (or 2705 counting only the distinct ones).

The product of its digits is 57600, while the sum is 40.

The square root of 61855816 is about 7864.8468516558. The cubic root of 61855816 is about 395.4821138790.

The spelling of 61855816 in words is "sixty-one million, eight hundred fifty-five thousand, eight hundred sixteen".