61681512 has 32 divisors (see below), whose sum is σ = 154486080. Its totient is φ = 20522880.

The previous prime is 61681511. The next prime is 61681513. The reversal of 61681512 is 21518616.

It is an interprime number because it is at equal distance from previous prime (61681511) and next prime (61681513).

It is a super-2 number, since 2×61681512² = 7609217845212288, 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 61681512.

It is not an unprimeable number, because it can be changed into a prime (61681511) 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, 13108 + ... + 17180.

It is an arithmetic number, because the mean of its divisors is an integer number (4827690).

Almost surely, 2^61681512 is an apocalyptic number.

It is an amenable number.

61681512 is an abundant number, since it is smaller than the sum of its proper divisors (92804568).

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

61681512 is a wasteful number, since it uses less digits than its factorization.

61681512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4713 (or 4709 counting only the distinct ones).

The product of its digits is 2880, while the sum is 30.

The square root of 61681512 is about 7853.7578266713. The cubic root of 61681512 is about 395.1102869951.

It can be divided in two parts, 616 and 81512, that added together give a palindrome (82128).

The spelling of 61681512 in words is "sixty-one million, six hundred eighty-one thousand, five hundred twelve".