61787690 has 64 divisors (see below), whose sum is σ = 124104960. Its totient is φ = 22041600.

The previous prime is 61787653. The next prime is 61787701. The reversal of 61787690 is 9678716.

It is a super-2 number, since 2×61787690² = 7635437271072200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 409115 + ... + 409265.

It is an arithmetic number, because the mean of its divisors is an integer number (1939140).

Almost surely, 2^61787690 is an apocalyptic number.

61787690 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

61787690 is a wasteful number, since it uses less digits than its factorization.

61787690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287.

The product of its (nonzero) digits is 127008, while the sum is 44.

The square root of 61787690 is about 7860.5146141967. The cubic root of 61787690 is about 395.3368701302.

The spelling of 61787690 in words is "sixty-one million, seven hundred eighty-seven thousand, six hundred ninety".