61292720 has 40 divisors (see below), whose sum is σ = 146364144. Its totient is φ = 23853312.

The previous prime is 61292717. The next prime is 61292729. The reversal of 61292720 is 2729216.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (61292729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7394 + ... + 13313.

Almost surely, 2^61292720 is an apocalyptic number.

It is an amenable number.

61292720 is an abundant number, since it is smaller than the sum of its proper divisors (85071424).

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

61292720 is a wasteful number, since it uses less digits than its factorization.

61292720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20757 (or 20751 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 61292720 is about 7828.9667262034. The cubic root of 61292720 is about 394.2783812561.

The spelling of 61292720 in words is "sixty-one million, two hundred ninety-two thousand, seven hundred twenty".