61812860 has 48 divisors (see below), whose sum is σ = 133021056. Its totient is φ = 24121152.

The previous prime is 61812851. The next prime is 61812899. The reversal of 61812860 is 6821816.

It is a super-2 number, since 2×61812860² = 7641659322759200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 218279 + ... + 218561.

It is an arithmetic number, because the mean of its divisors is an integer number (2771272).

Almost surely, 2^61812860 is an apocalyptic number.

It is an amenable number.

61812860 is an abundant number, since it is smaller than the sum of its proper divisors (71208196).

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

61812860 is a wasteful number, since it uses less digits than its factorization.

61812860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522 (or 520 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 61812860 is about 7862.1154913929. The cubic root of 61812860 is about 395.3905446737.

The spelling of 61812860 in words is "sixty-one million, eight hundred twelve thousand, eight hundred sixty".