61678590 has 16 divisors (see below), whose sum is σ = 148028688. Its totient is φ = 16447616.

The previous prime is 61678583. The next prime is 61678597. The reversal of 61678590 is 9587616.

It is an interprime number because it is at equal distance from previous prime (61678583) and next prime (61678597).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61678597) 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 7 ways as a sum of consecutive naturals, for example, 1027947 + ... + 1028006.

It is an arithmetic number, because the mean of its divisors is an integer number (9251793).

Almost surely, 2^61678590 is an apocalyptic number.

61678590 is an abundant number, since it is smaller than the sum of its proper divisors (86350098).

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

61678590 is a wasteful number, since it uses less digits than its factorization.

61678590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2055963.

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 61678590 is about 7853.5717988696. The cubic root of 61678590 is about 395.1040477918.

The spelling of 61678590 in words is "sixty-one million, six hundred seventy-eight thousand, five hundred ninety".