61664536 has 8 divisors (see below), whose sum is σ = 115621020. Its totient is φ = 30832264.

The previous prime is 61664531. The next prime is 61664579. The reversal of 61664536 is 63546616.

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 61664495 and 61664504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61664531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3854026 + ... + 3854041.

Almost surely, 2^61664536 is an apocalyptic number.

It is an amenable number.

61664536 is a deficient number, since it is larger than the sum of its proper divisors (53956484).

61664536 is a wasteful number, since it uses less digits than its factorization.

61664536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7708073 (or 7708069 counting only the distinct ones).

The product of its digits is 77760, while the sum is 37.

The square root of 61664536 is about 7852.6769957767. The cubic root of 61664536 is about 395.0740362211.

The spelling of 61664536 in words is "sixty-one million, six hundred sixty-four thousand, five hundred thirty-six".