61621536 has 24 divisors (see below), whose sum is σ = 161756784. Its totient is φ = 20540480.

The previous prime is 61621517. The next prime is 61621589. The reversal of 61621536 is 63512616.

It is a tau number, because it is divible by the number of its divisors (24).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 320850 + ... + 321041.

It is an arithmetic number, because the mean of its divisors is an integer number (6739866).

Almost surely, 2^61621536 is an apocalyptic number.

It is an amenable number.

61621536 is an abundant number, since it is smaller than the sum of its proper divisors (100135248).

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

61621536 is a wasteful number, since it uses less digits than its factorization.

61621536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641904 (or 641896 counting only the distinct ones).

The product of its digits is 6480, while the sum is 30.

The square root of 61621536 is about 7849.9385984860. The cubic root of 61621536 is about 394.9821836754.

The spelling of 61621536 in words is "sixty-one million, six hundred twenty-one thousand, five hundred thirty-six".