61389790 has 64 divisors (see below), whose sum is σ = 140133888. Its totient is φ = 18806400.

The previous prime is 61389787. The next prime is 61389793. The reversal of 61389790 is 9798316.

It is an interprime number because it is at equal distance from previous prime (61389787) and next prime (61389793).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61389793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46317 + ... + 47623.

It is an arithmetic number, because the mean of its divisors is an integer number (2189592).

Almost surely, 2^61389790 is an apocalyptic number.

61389790 is an abundant number, since it is smaller than the sum of its proper divisors (78744098).

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

61389790 is a wasteful number, since it uses less digits than its factorization.

61389790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1393.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 61389790 is about 7835.1636868670. The cubic root of 61389790 is about 394.4864125740.

The spelling of 61389790 in words is "sixty-one million, three hundred eighty-nine thousand, seven hundred ninety".