61991350 has 24 divisors (see below), whose sum is σ = 122088168. Its totient is φ = 23337600.

The previous prime is 61991341. The next prime is 61991353. The reversal of 61991350 is 5319916.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61991353) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35616 + ... + 37315.

It is an arithmetic number, because the mean of its divisors is an integer number (5087007).

Almost surely, 2^61991350 is an apocalyptic number.

61991350 is a deficient number, since it is larger than the sum of its proper divisors (60096818).

61991350 is a wasteful number, since it uses less digits than its factorization.

61991350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72960 (or 72955 counting only the distinct ones).

The product of its (nonzero) digits is 7290, while the sum is 34.

The square root of 61991350 is about 7873.4585793030. The cubic root of 61991350 is about 395.7707537881.

The spelling of 61991350 in words is "sixty-one million, nine hundred ninety-one thousand, three hundred fifty".