61621436 has 12 divisors (see below), whose sum is σ = 107945880. Its totient is φ = 30779760.

The previous prime is 61621421. The next prime is 61621471. The reversal of 61621436 is 63412616.

It is a happy number.

61621436 is digitally balanced in base 2 and base 9, because in such bases it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

61621436 is strictly pandigital in base 9.

It is a junction number, because it is equal to n+sod(n) for n = 61621399 and 61621408.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2930 + ... + 11481.

It is an arithmetic number, because the mean of its divisors is an integer number (8995490).

Almost surely, 2^61621436 is an apocalyptic number.

It is an amenable number.

61621436 is a deficient number, since it is larger than the sum of its proper divisors (46324444).

61621436 is a wasteful number, since it uses less digits than its factorization.

61621436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15484 (or 15482 counting only the distinct ones).

The product of its digits is 5184, while the sum is 29.

The square root of 61621436 is about 7849.9322290068. The cubic root of 61621436 is about 394.9819700150.

The spelling of 61621436 in words is "sixty-one million, six hundred twenty-one thousand, four hundred thirty-six".