61497720 has 48 divisors (see below), whose sum is σ = 199868760. Its totient is φ = 16399296.

The previous prime is 61497679. The next prime is 61497727. The reversal of 61497720 is 2779416.

It is a happy number.

61497720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 (61497727) 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 11 ways as a sum of consecutive naturals, for example, 85054 + ... + 85773.

Almost surely, 2^61497720 is an apocalyptic number.

61497720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61497720 is an abundant number, since it is smaller than the sum of its proper divisors (138371040).

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

61497720 is a wasteful number, since it uses less digits than its factorization.

61497720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170844 (or 170837 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 61497720 is about 7842.0482018411. The cubic root of 61497720 is about 394.7174607186.

The spelling of 61497720 in words is "sixty-one million, four hundred ninety-seven thousand, seven hundred twenty".