61669764 has 72 divisors (see below), whose sum is σ = 168815192. Its totient is φ = 18869760.

The previous prime is 61669753. The next prime is 61669789. The reversal of 61669764 is 46796616.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 14884164 + 46785600 = 3858^2 + 6840^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 146274 + ... + 146694.

Almost surely, 2^61669764 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61669764, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84407596).

61669764 is an abundant number, since it is smaller than the sum of its proper divisors (107145428).

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

61669764 is a wasteful number, since it uses less digits than its factorization.

61669764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 757 (or 752 counting only the distinct ones).

The product of its digits is 326592, while the sum is 45.

The square root of 61669764 is about 7853.0098688337. The cubic root of 61669764 is about 395.0852008700.

The spelling of 61669764 in words is "sixty-one million, six hundred sixty-nine thousand, seven hundred sixty-four".