61213830 has 16 divisors (see below), whose sum is σ = 146913264. Its totient is φ = 16323680.

The previous prime is 61213807. The next prime is 61213837. The reversal of 61213830 is 3831216.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 61213830.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61213837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1020201 + ... + 1020260.

It is an arithmetic number, because the mean of its divisors is an integer number (9182079).

Almost surely, 2^61213830 is an apocalyptic number.

61213830 is an abundant number, since it is smaller than the sum of its proper divisors (85699434).

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

61213830 is a wasteful number, since it uses less digits than its factorization.

61213830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2040471.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 61213830 is about 7823.9267634609. The cubic root of 61213830 is about 394.1091497607.

The spelling of 61213830 in words is "sixty-one million, two hundred thirteen thousand, eight hundred thirty".