61812830 has 32 divisors (see below), whose sum is σ = 115123680. Its totient is φ = 23879680.

The previous prime is 61812797. The next prime is 61812841. The reversal of 61812830 is 3821816.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 61812793 and 61812802.

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, 43166 + ... + 44574.

It is an arithmetic number, because the mean of its divisors is an integer number (3597615).

Almost surely, 2^61812830 is an apocalyptic number.

61812830 is a deficient number, since it is larger than the sum of its proper divisors (53310850).

61812830 is a wasteful number, since it uses less digits than its factorization.

61812830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1564.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 61812830 is about 7862.1135835092. The cubic root of 61812830 is about 395.3904807079.

The spelling of 61812830 in words is "sixty-one million, eight hundred twelve thousand, eight hundred thirty".