61699320 has 160 divisors (see below), whose sum is σ = 210394800. Its totient is φ = 16215552.

The previous prime is 61699291. The next prime is 61699321. The reversal of 61699320 is 2399616.

61699320 is a `hidden beast` number, since 616 + 9 + 9 + 32 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61699321) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 443811 + ... + 443949.

Almost surely, 2^61699320 is an apocalyptic number.

61699320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61699320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105197400).

61699320 is an abundant number, since it is smaller than the sum of its proper divisors (148695480).

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

61699320 is a wasteful number, since it uses less digits than its factorization.

61699320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299 (or 286 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 61699320 is about 7854.8914696513. The cubic root of 61699320 is about 395.1483072854.

The spelling of 61699320 in words is "sixty-one million, six hundred ninety-nine thousand, three hundred twenty".