61720372 has 24 divisors (see below), whose sum is σ = 125536320. Its totient is φ = 26002560.

The previous prime is 61720369. The next prime is 61720397. The reversal of 61720372 is 27302716.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 61720372.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17029 + ... + 20332.

It is an arithmetic number, because the mean of its divisors is an integer number (5230680).

Almost surely, 2^61720372 is an apocalyptic number.

It is an amenable number.

61720372 is an abundant number, since it is smaller than the sum of its proper divisors (63815948).

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

61720372 is a wasteful number, since it uses less digits than its factorization.

61720372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37431 (or 37429 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 28.

The square root of 61720372 is about 7856.2314120703. The cubic root of 61720372 is about 395.1932441190.

The spelling of 61720372 in words is "sixty-one million, seven hundred twenty thousand, three hundred seventy-two".