61900000 has 72 divisors (see below), whose sum is σ = 152568360. Its totient is φ = 24720000.

The previous prime is 61899997. The next prime is 61900019. The reversal of 61900000 is 916.

It is a super-2 number, since 2×61900000² = 7663220000000000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 99691 + ... + 100309.

It is an arithmetic number, because the mean of its divisors is an integer number (2119005).

Almost surely, 2^61900000 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 61900000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76284180).

61900000 is an abundant number, since it is smaller than the sum of its proper divisors (90668360).

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

61900000 is an frugal number, since it uses more digits than its factorization.

61900000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654 (or 626 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 61900000 is about 7867.6553051084. The cubic root of 61900000 is about 395.5762565908.

Adding to 61900000 its reverse (916), we get a palindrome (61900916).

The spelling of 61900000 in words is "sixty-one million, nine hundred thousand".