61297320 has 64 divisors (see below), whose sum is σ = 210165120. Its totient is φ = 14010624.

The previous prime is 61297319. The next prime is 61297321. The reversal of 61297320 is 2379216.

61297320 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (61297319) and next prime (61297321).

It is a super-3 number, since 3×61297320³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (61297321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35647 + ... + 37326.

It is an arithmetic number, because the mean of its divisors is an integer number (3283830).

Almost surely, 2^61297320 is an apocalyptic number.

61297320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61297320 is an abundant number, since it is smaller than the sum of its proper divisors (148867800).

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

61297320 is a wasteful number, since it uses less digits than its factorization.

61297320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72994 (or 72990 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 61297320 is about 7829.2605014778. The cubic root of 61297320 is about 394.2882445002.

The spelling of 61297320 in words is "sixty-one million, two hundred ninety-seven thousand, three hundred twenty".