61640002 has 8 divisors (see below), whose sum is σ = 94959036. Its totient is φ = 29986992.

The previous prime is 61639969. The next prime is 61640003. The reversal of 61640002 is 20004616.

It can be written as a sum of positive squares in 2 ways, for example, as 50424201 + 11215801 = 7101^2 + 3349^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (61640003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 416413 + ... + 416560.

Almost surely, 2^61640002 is an apocalyptic number.

61640002 is a deficient number, since it is larger than the sum of its proper divisors (33319034).

61640002 is a wasteful number, since it uses less digits than its factorization.

61640002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 833012.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 61640002 is about 7851.1146979267. The cubic root of 61640002 is about 395.0216342367.

Adding to 61640002 its reverse (20004616), we get a palindrome (81644618).

The spelling of 61640002 in words is "sixty-one million, six hundred forty thousand, two".