61964609 has 16 divisors (see below), whose sum is σ = 75427200. Its totient is φ = 49691904.

The previous prime is 61964597. The next prime is 61964627. The reversal of 61964609 is 90646916.

It is a cyclic number.

It is not a de Polignac number, because 61964609 - 2¹² = 61960513 is a prime.

It is a super-2 number, since 2×61964609² = 7679225537045762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61964699) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19847 + ... + 22755.

It is an arithmetic number, because the mean of its divisors is an integer number (4714200).

Almost surely, 2^61964609 is an apocalyptic number.

It is an amenable number.

61964609 is a deficient number, since it is larger than the sum of its proper divisors (13462591).

61964609 is a wasteful number, since it uses less digits than its factorization.

61964609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3112.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 61964609 is about 7871.7602224661. The cubic root of 61964609 is about 395.7138381708.

The spelling of 61964609 in words is "sixty-one million, nine hundred sixty-four thousand, six hundred nine".