61426624 has 56 divisors (see below), whose sum is σ = 143833088. Its totient is φ = 25470720.

The previous prime is 61426613. The next prime is 61426637. The reversal of 61426624 is 42662416.

It is a tau number, because it is divible by the number of its divisors (56).

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11677 + ... + 16099.

It is an arithmetic number, because the mean of its divisors is an integer number (2568448).

Almost surely, 2^61426624 is an apocalyptic number.

61426624 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61426624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71916544).

61426624 is an abundant number, since it is smaller than the sum of its proper divisors (82406464).

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

61426624 is a wasteful number, since it uses less digits than its factorization.

61426624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4473 (or 4463 counting only the distinct ones).

The product of its digits is 13824, while the sum is 31.

The square root of 61426624 is about 7837.5138915347. The cubic root of 61426624 is about 394.5652943521.

The spelling of 61426624 in words is "sixty-one million, four hundred twenty-six thousand, six hundred twenty-four".