61391284 has 24 divisors (see below), whose sum is σ = 117427968. Its totient is φ = 27957120.

The previous prime is 61391273. The next prime is 61391287. The reversal of 61391284 is 48219316.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61391287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12454 + ... + 16669.

It is an arithmetic number, because the mean of its divisors is an integer number (4892832).

Almost surely, 2^61391284 is an apocalyptic number.

It is an amenable number.

61391284 is a deficient number, since it is larger than the sum of its proper divisors (56036684).

61391284 is a wasteful number, since it uses less digits than its factorization.

61391284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29175 (or 29173 counting only the distinct ones).

The product of its digits is 10368, while the sum is 34.

The square root of 61391284 is about 7835.2590257119. The cubic root of 61391284 is about 394.4896126606.

The spelling of 61391284 in words is "sixty-one million, three hundred ninety-one thousand, two hundred eighty-four".