61997970 has 16 divisors (see below), whose sum is σ = 148795200. Its totient is φ = 16532784.

The previous prime is 61997953. The next prime is 61997983. The reversal of 61997970 is 7979916.

It is an unprimeable number.

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, 1033270 + ... + 1033329.

It is an arithmetic number, because the mean of its divisors is an integer number (9299700).

Almost surely, 2^61997970 is an apocalyptic number.

61997970 is an abundant number, since it is smaller than the sum of its proper divisors (86797230).

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

61997970 is a wasteful number, since it uses less digits than its factorization.

61997970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2066609.

The product of its (nonzero) digits is 214326, while the sum is 48.

The square root of 61997970 is about 7873.8789678277. The cubic root of 61997970 is about 395.7848412865.

It can be divided in two parts, 619 and 97970, that added together give a palindrome (98589).

The spelling of 61997970 in words is "sixty-one million, nine hundred ninety-seven thousand, nine hundred seventy".