61667320 has 64 divisors (see below), whose sum is σ = 163023840. Its totient is φ = 20697600.

The previous prime is 61667317. The next prime is 61667323. The reversal of 61667320 is 2376616.

It is an interprime number because it is at equal distance from previous prime (61667317) and next prime (61667323).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61667323) 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, 330 + ... + 11110.

Almost surely, 2^61667320 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 61667320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81511920).

61667320 is an abundant number, since it is smaller than the sum of its proper divisors (101356520).

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

61667320 is a wasteful number, since it uses less digits than its factorization.

61667320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10816 (or 10812 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 61667320 is about 7852.8542581663. The cubic root of 61667320 is about 395.0799816674.

The spelling of 61667320 in words is "sixty-one million, six hundred sixty-seven thousand, three hundred twenty".