61890426 has 64 divisors (see below), whose sum is σ = 149466240. Its totient is φ = 18869760.

The previous prime is 61890419. The next prime is 61890457. The reversal of 61890426 is 62409816.

It is a super-2 number, since 2×61890426² = 7660849660922952, which contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 91626 + ... + 92298.

It is an arithmetic number, because the mean of its divisors is an integer number (2335410).

Almost surely, 2^61890426 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61890426, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74733120).

61890426 is an abundant number, since it is smaller than the sum of its proper divisors (87575814).

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

61890426 is a wasteful number, since it uses less digits than its factorization.

61890426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 828 (or 822 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 61890426 is about 7867.0468410961. The cubic root of 61890426 is about 395.5558611015. Note that the first 3 decimals are identical.

The spelling of 61890426 in words is "sixty-one million, eight hundred ninety thousand, four hundred twenty-six".