61209816 has 24 divisors (see below), whose sum is σ = 153120420. Its totient is φ = 20390496.

The previous prime is 61209791. The next prime is 61209817. The reversal of 61209816 is 61890216.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61209817) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37530 + ... + 39126.

Almost surely, 2^61209816 is an apocalyptic number.

It is an amenable number.

61209816 is an abundant number, since it is smaller than the sum of its proper divisors (91910604).

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

61209816 is an equidigital number, since it uses as much as digits as its factorization.

61209816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3203 (or 1602 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 61209816 is about 7823.6702384495. The cubic root of 61209816 is about 394.1005352112.

The spelling of 61209816 in words is "sixty-one million, two hundred nine thousand, eight hundred sixteen".