61640236 has 18 divisors (see below), whose sum is σ = 125482308. Its totient is φ = 26417160.

The previous prime is 61640221. The next prime is 61640279. The reversal of 61640236 is 63204616.

61640236 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 157050 + ... + 157441.

Almost surely, 2^61640236 is an apocalyptic number.

It is an amenable number.

61640236 is an abundant number, since it is smaller than the sum of its proper divisors (63842072).

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

61640236 is a wasteful number, since it uses less digits than its factorization.

61640236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314509 (or 314500 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 61640236 is about 7851.1296002550. The cubic root of 61640236 is about 395.0221341012.

The spelling of 61640236 in words is "sixty-one million, six hundred forty thousand, two hundred thirty-six".