61901440 has 48 divisors (see below), whose sum is σ = 148460490. Its totient is φ = 24680960.

The previous prime is 61901429. The next prime is 61901447. The reversal of 61901440 is 4410916.

It can be written as a sum of positive squares in only one way, i.e., 55711296 + 6190144 = 7464^2 + 2488^2 .

It is not an unprimeable number, because it can be changed into a prime (61901447) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 198885 + ... + 199195.

Almost surely, 2^61901440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61901440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74230245).

61901440 is an abundant number, since it is smaller than the sum of its proper divisors (86559050).

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

61901440 is an frugal number, since it uses more digits than its factorization.

61901440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641 (or 318 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 61901440 is about 7867.7468184989. The cubic root of 61901440 is about 395.5793240404.

The spelling of 61901440 in words is "sixty-one million, nine hundred one thousand, four hundred forty".