61891284 has 144 divisors (see below), whose sum is σ = 188780928. Its totient is φ = 15365376.

The previous prime is 61891259. The next prime is 61891301. The reversal of 61891284 is 48219816.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 394134 + ... + 394290.

Almost surely, 2^61891284 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 61891284, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94390464).

61891284 is an abundant number, since it is smaller than the sum of its proper divisors (126889644).

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

61891284 is a wasteful number, since it uses less digits than its factorization.

61891284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222 (or 201 counting only the distinct ones).

The product of its digits is 27648, while the sum is 39.

The square root of 61891284 is about 7867.1013721701. The cubic root of 61891284 is about 395.5576889845.

The spelling of 61891284 in words is "sixty-one million, eight hundred ninety-one thousand, two hundred eighty-four".