902451978 has 48 divisors (see below), whose sum is σ = 2012063976. Its totient is φ = 292118400.

The previous prime is 902451959. The next prime is 902452003. The reversal of 902451978 is 879154209.

It can be written as a sum of positive squares in 4 ways, for example, as 887265369 + 15186609 = 29787^2 + 3897^2 .

It is a super-2 number, since 2×902451978² = 1628839145192224968, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 465900 + ... + 467832.

Almost surely, 2^902451978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 902451978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1006031988).

902451978 is an abundant number, since it is smaller than the sum of its proper divisors (1109611998).

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

902451978 is a wasteful number, since it uses less digits than its factorization.

902451978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2679 (or 2676 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The square root of 902451978 is about 30040.8385036104. The cubic root of 902451978 is about 966.3653890816.

The spelling of 902451978 in words is "nine hundred two million, four hundred fifty-one thousand, nine hundred seventy-eight".