61861490 has 32 divisors (see below), whose sum is σ = 117386496. Its totient is φ = 23425600.

The previous prime is 61861469. The next prime is 61861493. The reversal of 61861490 is 9416816.

It is a self number, because there is not a number n which added to its sum of digits gives 61861490.

It is not an unprimeable number, because it can be changed into a prime (61861493) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21899 + ... + 24561.

It is an arithmetic number, because the mean of its divisors is an integer number (3668328).

Almost surely, 2^61861490 is an apocalyptic number.

61861490 is a deficient number, since it is larger than the sum of its proper divisors (55525006).

61861490 is a wasteful number, since it uses less digits than its factorization.

61861490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2794.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 61861490 is about 7865.2075624233. The cubic root of 61861490 is about 395.4942059615.

The spelling of 61861490 in words is "sixty-one million, eight hundred sixty-one thousand, four hundred ninety".