61431612 has 48 divisors (see below), whose sum is σ = 160199424. Its totient is φ = 18160000.

The previous prime is 61431607. The next prime is 61431619. The reversal of 61431612 is 21613416.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61431619) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 264 + ... + 11087.

It is an arithmetic number, because the mean of its divisors is an integer number (3337488).

Almost surely, 2^61431612 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 61431612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80099712).

61431612 is an abundant number, since it is smaller than the sum of its proper divisors (98767812).

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

61431612 is a wasteful number, since it uses less digits than its factorization.

61431612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11410 (or 11408 counting only the distinct ones).

The product of its digits is 864, while the sum is 24.

The square root of 61431612 is about 7837.8320982272. The cubic root of 61431612 is about 394.5759739690.

The spelling of 61431612 in words is "sixty-one million, four hundred thirty-one thousand, six hundred twelve".