61995987 has 12 divisors (see below), whose sum is σ = 89651640. Its totient is φ = 41283648.

The previous prime is 61995959. The next prime is 61996013. The reversal of 61995987 is 78959916.

It is not a de Polignac number, because 61995987 - 2⁷ = 61995859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61991987) 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, 5668 + ... + 12494.

It is an arithmetic number, because the mean of its divisors is an integer number (7470970).

Almost surely, 2^61995987 is an apocalyptic number.

61995987 is a deficient number, since it is larger than the sum of its proper divisors (27655653).

61995987 is a wasteful number, since it uses less digits than its factorization.

61995987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7842 (or 7839 counting only the distinct ones).

The product of its digits is 1224720, while the sum is 54.

The square root of 61995987 is about 7873.7530441334. The cubic root of 61995987 is about 395.7806215263.

The spelling of 61995987 in words is "sixty-one million, nine hundred ninety-five thousand, nine hundred eighty-seven".