61954640 has 80 divisors (see below), whose sum is σ = 164025216. Its totient is φ = 21542400.

The previous prime is 61954637. The next prime is 61954657. The reversal of 61954640 is 4645916.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 61954640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18710 + ... + 21770.

Almost surely, 2^61954640 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 61954640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82012608).

61954640 is an abundant number, since it is smaller than the sum of its proper divisors (102070576).

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

61954640 is a wasteful number, since it uses less digits than its factorization.

61954640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3108 (or 3102 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 61954640 is about 7871.1269841110. The cubic root of 61954640 is about 395.6926159340.

The spelling of 61954640 in words is "sixty-one million, nine hundred fifty-four thousand, six hundred forty".