61764919 has 4 divisors (see below), whose sum is σ = 61780696. Its totient is φ = 61749144.

The previous prime is 61764907. The next prime is 61764929. The reversal of 61764919 is 91946716.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 61764919 - 2⁵ = 61764887 is a prime.

It is a super-2 number, since 2×61764919² = 7629810438153122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61764929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2932 + ... + 11494.

It is an arithmetic number, because the mean of its divisors is an integer number (15445174).

Almost surely, 2^61764919 is an apocalyptic number.

61764919 is a deficient number, since it is larger than the sum of its proper divisors (15777).

61764919 is an equidigital number, since it uses as much as digits as its factorization.

61764919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15776.

The product of its digits is 81648, while the sum is 43.

The square root of 61764919 is about 7859.0660386588. The cubic root of 61764919 is about 395.2882988481.

It can be divided in two parts, 617 and 64919, that added together give a 16-th power (65536 = 2¹⁶).

The spelling of 61764919 in words is "sixty-one million, seven hundred sixty-four thousand, nine hundred nineteen".