61571970 has 48 divisors (see below), whose sum is σ = 168517440. Its totient is φ = 15554592.

The previous prime is 61571963. The next prime is 61571971. The reversal of 61571970 is 7917516.

It is a super-2 number, since 2×61571970² = 7582214979361800, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61571971) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16294 + ... + 19713.

It is an arithmetic number, because the mean of its divisors is an integer number (3510780).

Almost surely, 2^61571970 is an apocalyptic number.

61571970 is an abundant number, since it is smaller than the sum of its proper divisors (106945470).

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

61571970 is a wasteful number, since it uses less digits than its factorization.

61571970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36039 (or 36036 counting only the distinct ones).

The product of its (nonzero) digits is 13230, while the sum is 36.

The square root of 61571970 is about 7846.7808686110. The cubic root of 61571970 is about 394.8762524284.

The spelling of 61571970 in words is "sixty-one million, five hundred seventy-one thousand, nine hundred seventy".