61903644 has 24 divisors (see below), whose sum is σ = 157573248. Its totient is φ = 18758640.

The previous prime is 61903643. The next prime is 61903663. The reversal of 61903644 is 44630916.

It is a super-2 number, since 2×61903644² = 7664122280957472, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61903643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 234352 + ... + 234615.

It is an arithmetic number, because the mean of its divisors is an integer number (6565552).

Almost surely, 2^61903644 is an apocalyptic number.

It is an amenable number.

61903644 is an abundant number, since it is smaller than the sum of its proper divisors (95669604).

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

61903644 is a wasteful number, since it uses less digits than its factorization.

61903644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468985 (or 468983 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 61903644 is about 7867.8868827659. The cubic root of 61903644 is about 395.5840188503.

The spelling of 61903644 in words is "sixty-one million, nine hundred three thousand, six hundred forty-four".