61780842 has 48 divisors (see below), whose sum is σ = 138228480. Its totient is φ = 19931616.

The previous prime is 61780841. The next prime is 61780843. The reversal of 61780842 is 24808716.

It is an interprime number because it is at equal distance from previous prime (61780841) and next prime (61780843).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 61780797 and 61780806.

It is not an unprimeable number, because it can be changed into a prime (61780841) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 86784 + ... + 87492.

It is an arithmetic number, because the mean of its divisors is an integer number (2879760).

Almost surely, 2^61780842 is an apocalyptic number.

61780842 is an abundant number, since it is smaller than the sum of its proper divisors (76447638).

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

61780842 is a wasteful number, since it uses less digits than its factorization.

61780842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867 (or 864 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 61780842 is about 7860.0790072365. The cubic root of 61780842 is about 395.3222643789.

The spelling of 61780842 in words is "sixty-one million, seven hundred eighty thousand, eight hundred forty-two".