61868436 has 96 divisors (see below), whose sum is σ = 177881088. Its totient is φ = 16346880.

The previous prime is 61868419. The next prime is 61868461. The reversal of 61868436 is 63486816.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 59376 + ... + 60408.

It is an arithmetic number, because the mean of its divisors is an integer number (1852928).

Almost surely, 2^61868436 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61868436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88940544).

61868436 is an abundant number, since it is smaller than the sum of its proper divisors (116012652).

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

61868436 is a wasteful number, since it uses less digits than its factorization.

61868436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1101 (or 1099 counting only the distinct ones).

The product of its digits is 165888, while the sum is 42.

The square root of 61868436 is about 7865.6491149809. The cubic root of 61868436 is about 395.5090078463.

The spelling of 61868436 in words is "sixty-one million, eight hundred sixty-eight thousand, four hundred thirty-six".