61621516 has 12 divisors (see below), whose sum is σ = 117641160. Its totient is φ = 28009760.

The previous prime is 61621507. The next prime is 61621517. The reversal of 61621516 is 61512616.

It is a super-2 number, since 2×61621516² = 7594422468276512, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61621517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 700201 + ... + 700288.

It is an arithmetic number, because the mean of its divisors is an integer number (9803430).

Almost surely, 2^61621516 is an apocalyptic number.

It is an amenable number.

61621516 is a deficient number, since it is larger than the sum of its proper divisors (56019644).

61621516 is a wasteful number, since it uses less digits than its factorization.

61621516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1400504 (or 1400502 counting only the distinct ones).

The product of its digits is 2160, while the sum is 28.

The square root of 61621516 is about 7849.9373245906. The cubic root of 61621516 is about 394.9821409433.

Subtracting from 61621516 its reverse (61512616), we obtain a square (108900 = 330²).

The spelling of 61621516 in words is "sixty-one million, six hundred twenty-one thousand, five hundred sixteen".