61864869 has 16 divisors (see below), whose sum is σ = 90639360. Its totient is φ = 37221360.

The previous prime is 61864867. The next prime is 61864877. The reversal of 61864869 is 96846816.

It is not a de Polignac number, because 61864869 - 2¹ = 61864867 is a prime.

It is a super-2 number, since 2×61864869² = 7654524032774322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61864861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2157 + ... + 11330.

It is an arithmetic number, because the mean of its divisors is an integer number (5664960).

Almost surely, 2^61864869 is an apocalyptic number.

It is an amenable number.

61864869 is a deficient number, since it is larger than the sum of its proper divisors (28774491).

61864869 is a wasteful number, since it uses less digits than its factorization.

61864869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13640.

The product of its digits is 497664, while the sum is 48.

The square root of 61864869 is about 7865.4223662814. The cubic root of 61864869 is about 395.5014067289.

The spelling of 61864869 in words is "sixty-one million, eight hundred sixty-four thousand, eight hundred sixty-nine".