61720371 has 12 divisors (see below), whose sum is σ = 90408240. Its totient is φ = 40566960.

The previous prime is 61720369. The next prime is 61720397. The reversal of 61720371 is 17302716.

It is not a de Polignac number, because 61720371 - 2¹ = 61720369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61720171) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47656 + ... + 48933.

It is an arithmetic number, because the mean of its divisors is an integer number (7534020).

Almost surely, 2^61720371 is an apocalyptic number.

61720371 is a deficient number, since it is larger than the sum of its proper divisors (28687869).

61720371 is a wasteful number, since it uses less digits than its factorization.

61720371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96666 (or 96663 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 27.

The square root of 61720371 is about 7856.2313484265. The cubic root of 61720371 is about 395.1932419846.

The spelling of 61720371 in words is "sixty-one million, seven hundred twenty thousand, three hundred seventy-one".