61819530 has 32 divisors (see below), whose sum is σ = 148651200. Its totient is φ = 16453632.

The previous prime is 61819519. The next prime is 61819547. The reversal of 61819530 is 3591816.

It is a junction number, because it is equal to n+sod(n) for n = 61819491 and 61819500.

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, 16906 + ... + 20234.

It is an arithmetic number, because the mean of its divisors is an integer number (4645350).

Almost surely, 2^61819530 is an apocalyptic number.

61819530 is an abundant number, since it is smaller than the sum of its proper divisors (86831670).

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

61819530 is a wasteful number, since it uses less digits than its factorization.

61819530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3958.

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 61819530 is about 7862.5396660367. The cubic root of 61819530 is about 395.4047658788.

The spelling of 61819530 in words is "sixty-one million, eight hundred nineteen thousand, five hundred thirty".