61721650 has 48 divisors (see below), whose sum is σ = 120849408. Its totient is φ = 23408000.

The previous prime is 61721623. The next prime is 61721659. The reversal of 61721650 is 5612716.

It is not an unprimeable number, because it can be changed into a prime (61721659) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 219510 + ... + 219790.

It is an arithmetic number, because the mean of its divisors is an integer number (2517696).

Almost surely, 2^61721650 is an apocalyptic number.

61721650 is a deficient number, since it is larger than the sum of its proper divisors (59127758).

61721650 is a wasteful number, since it uses less digits than its factorization.

61721650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507 (or 502 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 61721650 is about 7856.3127483572. The cubic root of 61721650 is about 395.1959717623.

The spelling of 61721650 in words is "sixty-one million, seven hundred twenty-one thousand, six hundred fifty".